Seeing this chapter, then I think its safe to say that sanji too could clash with a yonko. Coz theres no way the oden(yamato) of strawhats is stronger than the monster trio. So I think sanji will defeat big mom and zoro defeats kaido. Maybe akainu will join the war so luffy have an opponent. And besides, theres really no arc for akainu. The final war would be against the goroseis so this is the time that akainu would be defeated.