I've actually changed my opinion. I think Nnoitra takes it with effort. I think his durability is too high to easily bypass and he has shown superior stamina from their limited showings. Vergo's speed though is a problem. From what I gather he is faster than Nnoitra.
Maybe, but it's an assumption that Kizaru's stamina is greater. We know Isshin could hold back the Janitor for a month straight without rest, Ichigo fought his inner self for the same time span as well and back when he was just Vice Captain tier he trained for 3 days straight to get the bankai. It's not a stretch to say Ichigo's stamina could be greater. I do see your point though.
Lol. Z has the greatest legacy of a single anime, but it's not close to the best. I am a fan. Goku and probably
Broly are among my top 10 anime characters but not much more than that. It's fairly strong in the grand scheme of anime but probably not even in the top 100 in terms of power. I can't name a hundred myself but several dozen sure. In quality it's somewhere in the middle in my opinion. In power it's upper mid level.
There's a flaw with that. In order to vaporize stone with air pressure you need thousands of times more power than if you hit it physically. Martial arts masters of today can break multiple bricks or stone tablets with contact, but the best most of them can do with air pressure is blow out a candle. Do you see what I'm saying? The difference is thousands of times. Also Ichigo tanked a fragor and smashed Kurohitsugi no sweat. Kizaru hasn't shown to top either attack so he would be incapable of harming Ichigo.
You're overlooking an important part though. All the supernovas survived as did others that were stronger of course Z,Whitebeard, Marco and what not. We've got somewhere between a half dozen to a dozen characters that survive his beams. There's no indication that they would fare well against Dangai Ichigo.
Round 1 Minato. Round 2 Itachi since it would be a near endless stalemate until eventually Minato had an opportunity to cancel Edo tensei. I believe he learned the cancel process from Kabuto. At least I think he can perform them seals for it.
That doesn't make it island level piercing. A bullet can pierce what a cannon can't destroy in some instances. That doesn't mean the bullet is stronger than the cannon ball, that just means its more focused and in total force is actually weaker.
He's powerful, but I Vergo's stamina is good enough, he could wear Nnoitra down. His ressureccion might be a big problem though as he regains his stamina and his wounds disappear on top of getting 4 more arms and 5 more scythes.