1. Luffy did use armament haki. He even commented that his Haki was not strong enough for this type of attack.
2. Great! Those were solid scans. I agree with you that ACE and Enel are island level. Ace is a yonko commander, hence he is considred High tier, not mid tier. Though you have successfully debunked my claim that island is Top Tier in one piece. I now believe that island and multi mountain busting is a high tier to top tier feat in one piece. We have to remember that this is the New World where only the mid-high to top tier characters come here. Hence there are 2 types of Midtier: Midtier in One Piece and Mid Tier in New World.
Mid tier in One Piece, in my opinion, belongs to characters with a bounty around 100 million such as East blue Luffy, Don krieg, etc. - people who are powerful enough to dominate and conquer the Four Seas but becomes Low Tier the moment they get to Grandline.
Mid Tier in New World, is on an entirely different level. Mid Tier in New world belongs to people like Pica and the 4 officers of Donquixote Family, or anyone below Yonko Commander level but still in leadership position such as Vice Admirals (except Garp obviously).
The High tiers are the people within the Yonko Commander Spectrum.
Ace belongs to High-mid Tier in New World since he is Yonko Commander Level. Current Luffy is solidly among the top High-Tiers since he is First Yonko Commanderlevel after his battle with Katakuri.
Top Tiers are Yonkos and Admirals obviously.
Hence, thanks to your effort, you convinced me that city to multi city busting feats are Mid NewWorld Tier, island and multi-mountain busting are High Tier feats. I agree now that island and multi mountain busting are CASUAL feats from Top Tiers. It was my mistake to consider island busting Akainu's MAX feat in this sense.
Now my opinion, instead of Bijuu Mode Naruto winning Akainu Easily, will be Bijuu Mode Naruto = Akainu because Bijuu Mode Naruto is casual multi-mountain busting as well. Akainu would destroy KCM Naruto.
Bijuu Sage Mode Naruto and beyond would still destroy Akainu, but thanks for correcting me.
5. Okay thanks for the correction as well.