I presume Carty is moved ASAP with Opilka getting close to playing and 2 worthy prospects already being held back besides. Carty likely returns a couple good picks (3rd+5th perhaps) as a strong OA goalie with a good record; possibly higher if he was scouted on any of the nights when he was simply outstanding.
Carty, unfortunately has pretty much been labelled "the traded one" . All season fans have said he'll be moved as soon as Opilka is back.
This has to be tough on him and I think his motivation might be affected. Why give it your all when you know you're going to finish the season somewhere else. I'm not saying that's his attitude. But the likelihood of being traded has to play with your mind.
Another thing to consider when it comes to making deals and getting younger players in return is that EVERY player in high-school has a no trade contract.
....According to the OHL website "High school players cannot be traded without the consent of the player and his family."
Luckly kids now finish high school a year early then they did some years ago.