So why not do it in one punch? He's obviously not there to waste time, he hasn't got all day.
The job when giving Logan a concussion was.....to give him a concussion. Why not use sufficient force to do it in a single hit?
You are also ignoring the statement that he CAN'T kill him, so even if he wanted to, he wouldn't be able to.
You're basically saying WWH punching someone multiple times shouldn't be used as an example of.....WWH punching someone multiple times.