Everyone can get bodied, I would like a better explanation than that for the tier change, TBH.
Azure Striker and JoJo have fought on equal terms with their higher tiers (Prevasion vs King Crimson). JoJo varies very heavily in power, but in most cases, is easily exploitable by NPI, any sort of AoE, superior skill to bypass their glass cannon durability, etc. As well, a lot of them really don't have great hax - hell,
Rohan Kishibe, the resident haxlord, isn't 8-C.
You could bring up Heaven Ascension DIO but that's obviously not OU at all, rather AG.
(For comparison, have fun naming a JoJo who could beat Crystal or Rogue from Nuclear Throne. It's a pretty small list.)
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Additionally,
Madness Combat for OU 9-A, as in low-hax fights they are incredibly skilled and have assloads of piercing gun damage and massive guns, alongside bullettime. In high-hax fights, well, Tricky beat 682. So.
Effectively, they are very good at scoring victories, no matter if it's a hax fight or not. Which is a good judging factor, imo - more than simply raw strength, it should be about being able to score wins while minimizing losses in a non-stomp fashion. The kinds of characters that could win a Brackets of their tier, for example. Those would be great OU, or even Ubers material, if they are utterly undefeatable by anyone at their level.
Also, 682 should be OU or Ubers, since without Extended Canon, he's beatable. By, say,
Tricky the Clow.