I think the comparisons you make are not apples for apples. Injured players come back under the guidance of the club and continue to train in some capacity. Taylan has not trained with a club at all. The truth is, no one knows how he will return as a player.
On behavioural clauses - No one needs behavioural clauses - these things that you would want in his contract are grounds for immediate dismissal anyway. No need for a clause. What would you put in there anyway? How would you define it? There are catch all clauses that cover behaviour in all employment contracts. Look at your own employment contract. I'm willing to bet if you punched someone on the street and they identified you as working for your company, there is some clause allowing them to terminate you without specifically having to say you are not allowed to commit violence in a clause.
Lastly and most importantly, these poor bastards in our current squad have busted their ass in pre-season, won 2 games and narrowly lost 1 and some prick is going to demand a spot in firsts without any form to his name? What would you say if the coach dropped you for a guy that hasn't played in a year and the team has been winning?
Either way, it is a risk for the club, however with spots open, you'd think it was a wink wink nudge nudge from the club to say, mate...show us you're serious. Show us you've still got it and show us you can stay out of trouble until the dust blows over and one of those spots is going to be yours. By June 30, he would have been on a full NRL contract (form permitting). If he is too short sighted to see that, then he is too far up his own ass and better he demands a first grade spot elsewhere.
I want to sign him, he needs to offer some good will - not come in making the big demands so early in the piece.