He's just another corporate slave
You are not just a slave when you have a justice
FOr now all Admirals are following their justice, more or less
Aka follows his and fought Ao for it
Ao try to follow it, he is a soldier so he has to act against his believes sometimes but he still fights for his believes and quit the Marine when Aka became FA
Fuji is following his own justice and even opposes direct orders
Ryo is totally happy with the system lol and follows his justice
I think its the same with Kizaru. One way or another he is following the path he wanted to