Going out on a limb. IF, big IF TPJ signs - DD, Kevolution and Ballard will have to keep him on a tight rope. Honestly at 27yr's of age - hes at a turning point in his life where he matures and takes opportunity or totally ***** it. For a low salary, strict conditions - what is the harm? Hes got max 5 yr's left of opportunity in the NRL.
If his behaviour is toxic, back to reggies. Year by year contract. He has the talent, but he hasn't had the discipline. If it happens and works its a master stroke. Worst case, its an extra man in the cap to bring up from reggies when needed. All will be on him to prove himself to fit back in and come up to the level that is expected.
Being around Carrigan, Reynolds, Haas, Taupau and Riki would only make him hungry if he is actually serious. There's a wealth of professionalism between those guys (yes ignore Haas previous issues). Its all on the table for him should he choose really. I don't think the team is that delicate that his presence will derail the squad - and really you have to think, that a GF team has a settled, strict and balanced system. It would be clear quickly if hes not fitting in or buying in.