It won't mess things up. You are too locked into Marineford power scaling. Wake up Erkan, Oda recently said that newcomers can read manga from the recent arc and they don't have to read previous 1000 chapters.
Even if you want to argue he was a mess during MF it's irrelevant since Oda will make him as strong as he wants and Mihawk indeed will be strong.
World's Strongest ( only WB and Kaido had titles like that ).
Marine hunter = yet to be explored but I am sure we will get something.
3.590b bounty.
He is not a bridger, yc or whatever. He is a Top Tier and a very strong at that.
Croc is 1.9 billion, you think he is stronger than Zolo? Or is that bounty boosted by Cross Guild Marine Hunting being a major threat to the Marines? Its obviously boosted like hell due to Cross Guild.
First of all you are too locked into titles, if you think Mihawk's title was introduced like ''Saikyo'' / Strongest first you are wrong.
It was introduced as ''Dai Kengou'' / Greatest first in chapter 0005 then many times again later, which is different than the ''Saikyo'' / Strongest titles of WB or Kaido etc.
Its a SKILL title, thats it.
Its called Strongest in other translations, but its sound like dumb translation, because you can say ''strongest marksman'', but it sounds dumb, you say ''greatest marksman'', that's the better translation, same for Mihawk's title. Its based on SKILL. Zolo vs. Alber proved that as well when Alber uses a sword to fight but still not called swordsman by Zolo.