Schwass was a quality player no doubt, but I'm just not sure if I would have him in this side, I'd perhaps have him on the bench. The fact he was traded, probably shows he's not quite at the top echelon.
Personal opinion only, i don't begrudge others' rating of him.
Re Sumich, I agree he was unlucky. Probably came to a choice between Gehrig and him. Perhaps Fraser was included as he was more versatile.