Quote: John Gilbert Reds "I don't think he was registered. There is a reason why during our injury crisis following the Easter period, he wasn't selected despite the fact we were short of props. I assume Hull KR must have registered him when he joined on loan?'"
We're going off what the rfl publish as their procedures so my knowledge gets a little hazier, but didn't he sign a 2 year deal? Unless otherwise explicitly stated in a contract, the rfl automatically registers a player for the length of the contract (this is how teams can demand first refusal on players going to RU/ NRL).
While not a cast iron rule, a good rule of thumb is: did he have a squad number at the start of the year?