It's not that Luffy can't use Haki, the dude can't even move, wtf.
Has it always been like this?
No he was moving very well when he use G4 against the number. It seems really like he use to much haki, usually Luffy should move by himself as we see against Katakuri and numbers.
Now the question is, what is BM gonna do? How is she going to fight alongside him? How is she going to be equal to him? Does she have some kind of new mode or unique ability? Besides her awakening of course.
I think her equal power to Kaido will be really something unique to with we didn´t see yet.
Awakening will be insane powerfull, im sure both Kaido and Bigmom having insane powerful awakened devilfruit powers.
I mean top tier awakened devilfruit is a stage better as what we see from high tiers.
As example Katakuri and Doffy awakening power where good but Bullet awakened power was crazy asf in the movie.
Im sure top tier awakening power going insane powerful.
Of course Oda don´t make BM use her equal power to Kaido hybrid version, since it would be really to much, Kaido alone will handle soon that soloo with his hybrid. Making a second character in same lvl would be to much for the whole alliance. Oda still holding back BigMom, yes her feats are impressive the last chapters but that is still nothing to what she capable to do.
Now we finally enter round2, where Kaido use his hybrid.
Round3 going be the last stage when Kaido use his awakening power after his crew get defeated.
The question is, do have the calamity the awakened power too? I think so.^^