If he looked like this, and was like Hiruzen and Asuma, then yes, he'd be boss. But since he's trying to be like Naruto, then he's a far cry from that xd
I am not sure when but he did it to become stronger and just like the first episode or what ever he thought that naruto was boss, so he wanted to be taught by him. So its the same thing he wanted to learn rasengun, and he knows giant rasengun now.