It's private.
I had a close family member get very sick and then die, it impacted on my work in some ways so I told my boss, but if anyone speculated on why I was missing from work or was under performing for a few months well it was none of their business. If I left it would have been none of their business either.
People are entitled to a personal life.
Even more so when you're in the public eye, otherwise you get situations like Harry Arter who was taunted about his daughters death. Some supporters around the league have shown themselves to be equally as crass.
This hits the nail on the head - just because these players play for our football club doesn't mean that they have to share their entire private lives with the general public. We don't get to choose what they want to remain private or not hepatitis, that is up to them. If they deem that any of those "issues" that you listed off are things that they'd prefer not to share, then they don't have to. Simple as that.
In Tratt's case, it's not any of the "may not have liked the club, may have issues with a team member, may have issues with Wellington" things you mentioned. That's the only reason I posted initially, because some were speculating that it was a sign of deeper issues at the club. It's nothing like that at all.
I'm sorry for even posting that because the way some posters in here have had a go at me for sharing that makes me thing I shouldn't share anything I hear about the club at all on here.