1. For me Kaido will not a awakening form, If he really had one, Oda we would have shown him rather in the fight no sense to show him now to see him lose 1 chapter later
2. It's not the kind of Oda to show us something for nothing in the end. I think the reaper plot is gonna take us somewhere
He managed to hurt Kaido by having 30 of his bones broken, Zoro is just built different bro