Well, nothing prevents the chaos player to simply move the Gaunts back to you and the Tyrant to his side after that. But you can make it a bit more difficult for the chaos player at least.
(Maybe
GW has played that way and therefore adjusted the point costs like they did...hehe...höhöh...well...no...let's not be silly here...<sniff&
gt
Greets
Schepp himself