If Kizaru gets killed by Teach it's win win for
@ZenZu
Zenzu doesn't really give a shit for Fuji and Greenbull. If Kizaru gets taken out in the light v darkness battle, he can push that Kizaru is unbeatable to anyone but Teach and then agree that Akainu >> Fuji and Greenbull.
It's only an issue for him when Kizaru sticks around, but like I said Oda chose to give Kizaru the same bounty as Greenbull.
He better job to Teach or retire. He disrupts the M3 v Admiral dynamic anyways.