Kinemon and momonosuke will be the nxt SH and all these 7 commanders will split up after defeating kaidou and all his territories will split up in half between luffy and law and they all will split up as they all are pirates and have their respective groups. They will be just be an alliance in need..............The main SHs will remain same just kinemon,momo and jinbei will add to the crew. Law will make each crew member as a leader of separate commander and will make strategy of attacking kaidou from respective places to weaken his forces and will fight one on one with kaidou. What if all this was a plan of law to take down kaiodu. He has a most intel on new world and dressrosa. He himself said that he knows everything about dressrosa except smile factory. So obviously he knows about colloseum and about his tournaments also. Maybe his plan was to use colloseum fighter from the very start so that luffy law alliance can fight with army to army and wanted to destroy smile factory, so that they wont get outnumbered again..