Black pulls another power out of his ass...
In this fight, both have knowledge of the other, and both are bloodlusted...
Goku also had extensive knowledge of Hit's abilities, and he was still killed in their encounter, so would you please explain to me how Black ISN'T going to be one shotted?
Tell me, how would Hit kill Black "like he did Goku" when at no point is Hit hidden from Black, and both have knowledge of the other?
And Goku DIDN'T have "extensive knowledge" of what Hit could do, Goku only knew that Hit was coming, and had fought him head up previously, he had no clue that Black could attack from long distances like he did.
Newsflash: Hit continuously improves, at a rate even faster than Black. When Hit fought Goku, Goku had to use 10x Kaioken to gain an advantage, but even then the advantage was short, and Hit eventually became even faster despite Goku using Kaioken x10.
Also, Goku fought Hit AFTER the Zamasu arc, which means he was even stronger than he was during the fights with Black. So please tell me how YOU believe Black would be able to kill Hit?
. When pushed, Black (just Black, no fusion) began tearing the fabric of reality a part while taking on both Vegita and Goku.
You also brought up the fact that Goku used Kaioken x10 against Hit... he only did that in the first fight to overwhelm Hit's Time-skip ability. Remember, Goku DIDN'T use Kaioken in the rematch, he only used SSJB, and specifically he used it while extending his aura to overwhelm Hit's new technique. Are you telling me that Black COULDN'T do the same thing in SSJR?
And also remember that Black has a Time Ring, probably the BEST artifact to allow someone to negate the affect of jumping ahead in time (Hit's Time-Skip). Just like how Black was able to sense and get a read on Trunk's time machine and travel to the past (a feat said impossible by Whis), I'm confident that Black could sense / get a read on Hit's Time-Skip ability no matter how much he improves it. Bottom line is that Hit hasn't done anything (yet) that Black hasn't seen, so I see no reason why Hit would be able to defeat him.
Think about it... As Black was fighting he was discovering more and more about he Sayian body (which was explicitly stated to have ), and the more and more familiar he got with it he was able to bring more control over his ki while fighting in it. Fighting Hit, Black may be able to pull out SSJR2, or even 3, but that is just complete speculation.
Final point, you say that because the Black arch came before the Hit fight that that means Hit is stronger... No.
I'll remind you that just before Zamasu merged, Black was TOYING with both Vegita and Goku at the same time. The only reason Black merged was because he felt Zamasu weakening, and they thought that merging would just be the final trump card against the "mortals". Thing was though, that the fusion was the reason Black lost, not because he was weaker. Final Black was out of Goku's league at that point, and sure Goku has improved slightly from that point before the Hit fight, but the size improvement is little to nothing in regards to the jumps in power Black was having mid battle.
One more comparison...
- Black toyed with Goku and Vegita through and through. The few times he got pissed/annoyed, were the times where he had massive jumps in power.
- Hit was forced to hold back against / not kill Goku in the tournament, and then later held back against him in the rematch after Goku skirted death. Both times though Hit was fighting to the best of his ability and could only match Goku.
Black destroys Hit because through his power boosts he'd just completely outclass him.
Hit improves in power more quickly than Black does.
Hit's "power" doesn't improve, his technique does. Hit and goku both noted that Hit hadn't gotten any stronger mid fight against Goku, but only that he "improved" hit timeskip ability. Black's power jumps are massive, and can outclass any mid fight improvement that Hit has shown.