I would say that we shouldn´t rush things because of a promo anime imagine, in the manga the sword was clear black shade like hardening, in the middle white, a black sword. Colored version should give us more information on that.
Maybe he has it or not.
About Kizaru, he is clearly not down, he will comeback and fight all for once again vs Luffy or others.
Awakened Kizaru is coming, I feel it.
Still one thing is clear for me, Kaido endurance feats and overall feats, it will be hard to top that.
Honest opinion, Luffy is still weaker than Kaido, im sure 100% Kaido vs 100% Luffy right now would end with Luffy lose.