The two first things I don't agree with but the last one I do. I didn't say he had to use it on everyone but he could just have done the same thing that Shisui was gonna do and use it on Fugaku.
He just got the Kotoamatsukami so he could have used that but again, he didn't. Also, try to maybe talk to his dad. Like maybe but nope. He could also have told any other shinobi about what Danzo did and stop him. Just a few suggestions.
In my opinion its either Saitama or Giorno Giovanna.
Saitama legit has no limits and his power/speed is infinite.
Giorno Giovanna can negate any attack that comes at him.
Thoughts?