Lets say he only has three commaders, the fist two are obvious Zoro and Sanji. The third I personally think it would be Usopp. I know some people would say it gonna Jimbei but I don't see him leaving Luffy's side. Anyways I say it Usopp cause his first dream was to become a brave warrior of the sea and I highly debut that he won't become one by the end of the series. Sure he doesn't have the strength to be a commader but he does have the intellect of one. He always gets puts in situation where he goes up against someone stronger than him (which I think is funny). No matter what situation he gets put in he sucks it up and does his best to win knowing he can't afford to lose also he never wants to let his crewmates down. Like I said he doesn't have the strength so he always looks for a tactical way to win, which makes sense he's a sniper. This brings me to his other dream which he said during the Post-War Arc, to be the true Sniper King. So doing so he has to be the best of the best which leads to him dueling his father, who is undefeated (OMG can't wait for this). During the Dressrosa Arc he awakened his CoO haki which puts him on another level compared to the rest of the crew. By the end of that Arc he ended up with the third highest bounty in the crew which will keep increasing. I know this subject has been discussed but I was bored and just wanted to put this out there so let me know what you guys think.