They're allowed to return, Gallant did it last year, although his situation is different cuz DET drafted him but then didnt sign him, it was SJ who signed him as a free agent then sent him back. Most teams just dont want a guy playing against teens if they deem him good enough to sign him to an ELC. Most of the time they want that player working with their own coaches in their own system. If there's an AHL season, I dont see how any of them are back. But if there's no AHL season, then I'd think some will be back cuz where else would they play?