I don't disagre with that notion but the only way I could see an awakening being pulled this late being justified is if it makes Kaido loses his sanity/have heavy drawback . Otherwise it would RUIN the last 20 chapters of Luffy vs Kaido if was actually holding back some powerful form just because. That woud mean everything until that point was glorified filler as Kaido wasn't actually that serious despite nothing implying that in the narrative. This simply does not work