If young players are good enough, they'll get their chance to develop under Baraclough. Concern is whether any are ready to make the step-up this season. Even Thomas after a promising introduction, looks some way from regular 1st team action. Watt is possibly at the top of the pecking order just now.
As for Leitch, I suspect we'd need to revert to a midfield 3 for him to prosper.
Regarding the striker situation and the current competition, I think Moult is the one we are banking on to develop and I'm sure he'd like to have the quality of McDonald around him.