I could see it working as long as there was no loot involved, otherwise it would be abused to the point of no return. Group A goes in to get their gear, player controlling said Primal is their friend/FC member, sits there and doesn't do anything. Also you would have to add timers all that to flesh out the being able to use. I could just imagine tho as a joke Titan jumping off the cliff and people just looking confused as hell, it would be a riot but I doubt it'll ever come to play.