So Bison's Devil's Reverse is at least +4 on block. I'm able to hit Ryu with c.MP (6 frames) after a blocked Devil's Reverse before his c.LP (4 frames) connects. It might be spacing dependent, but either way, as long as you hold down then you can link c.MP~DR into itself until your opponent figures a way out. Seems hard to deal with in the corner, and of course you can let the Head Stomp come out or go into anything else to bait out Shoryukens. Canceling into m.Double Knee Kick will actually beat Shoryukens. Going to continue to lab it and see what I ca figure out.
It also applies to his Somersault Skull Diver. Right now it looks like the only way out is a Shoryuken, but that's just based on practice mode; I'm sure each character has solid options. And even if it hits, you don't really get much other than some light damage and a knockdown, though you can combo Somersault into some serious damage, and you can cancel into CA at any point. (Somersault into s.HK-c.MP~DKP does 256 and that can be canceled into CA for crazy damage).