I feel he was the definition of an average joe and pretty much just went 5-5 with everybody with the odd 6-4 or 4-6 here and there.
I'm not sold on the size of his hitbox being a talking point either, when I first started investigating Kenshi, I heard this, that and the other about how he also struggles up close because he has the biggest crouching hitbox in the game, and honestly, he really doesn't. At least not in the context that goes around.
With all that said, I do believe he's in that massive pool of "could be top 10" characters, but it's still subjective to what you value in your tier list.
I agree with sine if the things you said however, shocker isn't made for aa. Standing 1 it's perfectly fine as an aa being 9 frames. Ex shocker and superman both have armor. He does have hitbox issues but he also has good walkspeed, backdash and his teleport. Great counter zoning, whiff punishing, and wall carry.
Range of AA > Speed of AA.