The most ironic part is he has the highest likelihood to land a hit and eventually beat him. Canonically it was shown anytime a new power ceiling is introduced he surpasses it and even turned back time. He's broken af. But then again that's literally his whole thing.

I think Saitama trying to punch him and realizing he can't is just gonna force him to increase his power ceiling same as his fight with Garou. Didn't he literally reach a point where he was able to turn back time? His whole character design is being OP. Like it's his whole thing is what people usually miss.

Hard to say like the physical resistance of the exercises I'd imagine were the initial "wall" and he became a kind of monster/entity that exists solely in surpassing barriers or something to that extent. So it's hard to say if constantly trying to punch Whis and Whis dodging is enough. I feel like it'd be in character that him missing would make him excited/wanting to accomplish that goal and depending how long Whis allowed this to happen instead of teleporting away or something or calming him down I'm sure theoretically he could reach and surpass him. Ironically I think Gohan is a similar situation when forced to adapt and faced against a wall he seemingly has similar adaptations but yeah potential not exercised and forced for both means they can't reach that level so it's a weird situation tbh.