@silentnightz: Look, I don't want to continue this back and forth that isn't going to lead us anywhere. All I'll say is that you keep trying to assign intent to what I am saying that is clearly not there. I've made it clear several times that it may be entirely possible that these high-ball interpretations of Bleach feats are totally accurate, and I've said over and over again that the low-ball interpretations that I am giving are almost certainly not exactly right. The reason I'm presenting them is to show how huge of a gap there is between the high ball estimate and the low ball estimate. Since the difference between these estimates are so astronomical, we cannot use them to justify making any real claims.
Despite this you have repeatedly assumed that I am making claims that I am not and even have gone so far as to assume either dishonesty or blanket ignorance on my part when I have admitted to mistakes I've made. I'll admit to another one right now, that I completely and utterly missed the second hole in the ceiling on the panel which shows the Lanza del Relampago, given that it's mostly hidden behind the sound effect word. That's 100% my bad.
I don't want to try and attribute willful ignorance on anyone's part and I'll accept that maybe I've not made my stance on these matters clear and so I'll take the blame on this one and try to clarify my positions one more time...today.
I am making no claims at all. I'm not claiming that Nel is an untrustworthy narrator. I'm only saying that we have no way of knowing how Nel came to her assessment and there are a great many different possible answers that create wildly varying results, which means that looking at the actual structures for ourselves is a more reliable means of trying to figure the answer out.
I trust Nel, but we can't know what Nel was thinking. That's the only point I was trying to make. Everything else was just reasons as to why there can be so many different interpretations of her intentions, not just the high-ball examples given. And the biggest argument against these high-ball interpretations, and the one you have never addressed, is that Nel's words "We don't have to break through the wall, it's only a 3 day walk" clearly show that she doesn't assume that Ichigo and co. are in a rush. It doesn't matter how old she actually is, her behavior clearly shows the naivete of a child.
As for the GRC thing, again I'm not making any assumptions. I know very well that the interpretation that I suggested is ridiculously low-balling. But no matter how much you might feel otherwise, since Ulquiorra never gives any info past the Espada not being allowed to use it because it could destroy Las Noches, it is a valid, albeit ridiculous interpretation. The whole point, just as with Nel, was to show that the possible interpretations are vast in their scope. And just because the pathetically low-ball interpretation I suggest is almost certainly wrong, doesn't mean that the other extreme, that the GRC can one-shot destroy the entire structure, is the only other option.
The reason that we cannot use character statements like Nel's 3 day walk or Ulquiorra's destruction of Las Noches as absolute fact is not because these characters are unreliable. They absolutely are reliable. The reason why statements like these are not a substitute for on-screen feats is because we as the readers do not know the context for what they are saying or what their own interpretations of their statements are. Ulquiorra is trying to psych Ichigo out and get a rise out of him in order to try and understand emotions. Nel was clearly not understanding the hero's rush to save Orihime. These alone are plenty reason to question what they intended by their statements.
As for Las Noches and the pillars, I 100% agree that Kubo's perspectives are weird and we cannot use any picture in isolation to gauge the size of Las Noches, which is why I tried to show several of them from different angles. But I used the image of Ulquiorra standing atop the pillar from below because no matter what your perspective is, that definitively shows the size of Ulquiorra compared to the Diameter of the pillar. We're looking at him and the pillar from the same angle so even if there is some dramatic foreshortening going on here, Ulquiorra and the diameter of the pillar should be at nearly the same focal point. Not exactly the same point, since he's standing on the edge of the pillar rather than in the center, but it's the closest we get in any image I found while re-reading the scene.
We cannot use ANY calculations of Las Noches from inside, because again, we see that from the outside of Las Noches from a perspective not much further back from the heroes when they first see the structure, we can see opposite corners of the structure. Yet in the day-lit desert inside we can see nothing in any direction. This is physically impossible unless illusions or some form of spacial expansion are being used. And since we have no idea how much, we cannot assume anything about the structure from the inside. It might as well be a TARDIS simply because we don't know.
My practice when it comes to these things is generally to take the highest feats that a character has shown, unless they are clear and obvious outliers, and then interpret them as conservatively as possible within reason. Since anything higher than this becomes more questionable when it comes to a character's potential. In here I have been going out of my way to be excessively extreme with this philosophy in order to show how inconsistent high-ball scaling can be. Because even though I am certain that Hallibel is better than the estimation I am giving her, I know for certain that she can do everything that I am attributing to her, but the more you high-ball her the more and more unlikely it is that she actually measures up to that.
So going back to the bare minimum of what we know Harribel can do and the bare minimum of what we see Sanji can do, Harribel takes a majority against him with her Sonido being much faster than his speed but also mitigated by his Observation, her damage output being higher, but his speed being faster than her without Sonido and his having better durability showings. If you take more high-ball estimates of both characters, Harribel she wins much more consistently with FAR higher stats across the board (partially because despite it's cartoony nature, One Piece has much more direct and understandable feats that don't require so much guesswork, at least until you get to the weirdness of the top tiers like Whitebeard)