He trusted him before getting defeated. Right now, Zoro has no opponents, Sanji will certainly fight Queen and Marco is fighting King. Marco fought BB and he's WB's 1st division commander, please don't disrespect him like the others and say that he will lose or leave the fight.
After this chapter, Kaido getting killed at the end of Wano is pretty much confirmed. He is not the type of character who you can break his will or put down with a couple of punches, he has to die. The best candidate to kill him is Zoro.