He aint doing shit.
He smacked Kuzan with aCoC Galaxy Fist several chapters ago and Kuzan is back without any serious consequences.
Punchers arent doing shit, doesnt matter how strong they punch. They are simply ineffective fighters.
One nameless stab from Shiryu intended for Coby and Garp is already feeling the consequences of it...
This is just a hype train before the demise, Oda's usual narrative device.
The characters that ultimately ends up losing, gets solid feats before it.
We have seen it countless times before, it is nothing new.
On top of my head - Marco, Oden, Whitebeard... Same shit, does few WoW things, ends up losing soon after.