It kinda bugs me how none of the gladiators got parasited, that parasite thing it's been hyped for so long just to end up being a fodder removal
:/
The impression i get is that Mingo can fully control fodder but can only stop the movements of stronger willed people. Seriously doubt he can do that to the very strong willed.
Take Jozu and Sanji: he immobilized them but didn't make them do things against their will, unlike with that WB commander back in Marineford arc (name escapes me right now) or with king Riku.
If he could control Sanji, wouldn't that make a better move then what he did when he tried to take out Law and the gang @ the ship? If he had been able to do that, it would have been Mingo and Sanji VS Law and gang, which would have much more favourable odds of success, and yet he didn't.