If Manly didn't see the value in him and Bennett didn't see the value in him why would it change at the Tigers. 3 years after his last 1st grade game and a lifetime after his last decent match.
Not sure Bennett or Manly didn't see the value in him. They both offered him contracts at the start of last year. It was Schuster who chose to walk away from that contract mid last year.
Why would it change here? Well, it probably won't so I'll change that to why might it change here?
Intrinsic motivation. He has taken time away and he has now decided that he wants to return the game. I don't know what the mental health concerns are/were but he has decided he is putting that behind him and looking to return to the sport. For his own reasons, not for others.
We've seen plenty of others walk away and successfully return to the game with a new mindset. Harris-Tevita just recently. Jake Clifford and Jamie Lyon in the past. Closer to home Moses Suli (never actually left but looked likely to be lost to the game at one point).
He will be around his mates. Not just team mates but childhood friends in the Fainus, a couple of which he has been playing alongside his whole life.
His issues are documented. This shouldn't be a case of not knowing what is wrong with Schuster. He knows his concerns, the club will know his concerns before offering a contract. A management plan should be in place alongside any contract offer.
No external expectations. A min wager, likely slated for ressies isn't carrying the public pressure of expectations compared to the 800K salary he was once on.
Finally all of the above combined should mean he now has a better support system around him both in and away from the club.
Will it be enough? Who knows. The odds are probably against him. But I think I'd rather punt on him than a guy who looks likely to not be good enough anyways, who realistically are faced with equally poor odds for differing reasons.