I still wonder if Rocks will be a relevant character outside of flashbacks. Idk, I have this eerie feeling based on comments from Oda, editors, one anime director, and even the story itself, the "looming" threat of Rocks goes beyond Kaido and BM.
Is he still alive? Is he tied to Kaido in a deeper way than we think? Just a weird plotline that would feel oddly unfinished if he was only a flashback character