How the club would choose to manage it and the game's protocols might be two different things.
I think the bigger question might revolve around how often the decision needs making.
To quote Barry McGuigan "once you've lost that ability to take a shot you never, ever get it back". I think he's spot on wrt boxing but not sure about RL. My guess is that there are some players that are susceptible to being concussed though probably a lower percentage than in boxing. I'm not talking about Morgan specifically in this last bit I should add - hopefully his recovery is now complete.

I just cannot see any point at all in signing Livett, he’s surplus to requirements at one of the 3 worst sides in the league, and is utter gash! its the sort of signing Rowan smith would make, and how we are still trying to get rid of deadwood, not sign more deadwood.

He looked a real break out player a few years ago but has regressed to championship ship std at best.

The stories about Mom being home sick don’t really fit when he going to France.

What stories about him being homesick? If anything the stories about him going into coaching in Australia (implying ongoing injury issues) are the ones that are being called into question by this news. Maybe he just didn't settle in Leeds, didn't have a clear idea what he wanted to do next, and then a good opportunity presented itself? Maybe France suits him better than Leeds? Maybe men having their hair a couple of inches longer than average doesn't carry the same stigma as it does in the north of England

Christopher said he had heard he / wife were homesick. Hope that helps

I think it's obvious he didn't leave entirely voluntarily.