Say what you will, Croc is a goat, and beating a frigging sand logia would be a nice feat for Sanji.
Imagie him outrunning the sand, plus we'd finally see his haki work well.
Well, at least Buggy is funnier than Luffy, if we're going to have a goofy fight, Buggy has my vote tbh, the more I see Nika, the less I like OP.
Plus I doubt Cross Guild will be final-final villain, they're gotta stand in the line after BB and Imu for that