for me the mistake he did might be one that is just a story to make him join Kaido's crew as spy. just like X-drake did he used his DF to join the beast pirates.
so i might be true after all that he is a CP-agent .
My bet is that Lucci was the one who was suposed to get the Ancient Saber Tiger fruit, but Who's Who got it as a mistake, so he got locked up for it. Maybe they faked his escape from Impel Down so that he would join the Beast Pirates, but they actually wanted Lucci to get inside Kaido's crew.
Alone the fact that Oda show the top dogs to enter hybrid first let me believe that the other one going to have awakenend forms.
From now it going be a roller coaster and I hope we see some cool awakanened forms later.