Byfield as the centrepiece of a return would make a lot of sense imo.
I think it makes sense in a scenario where Matthews wants out or they choose keeping Marner over Matthews.
I don't think he is the type of player they need but the type of player they need probably isn't available short of signing Bennett. If Bennett gets around 8M, they could pay both Byfield and Bennett with Matthews cap.
They are in a strange situation because on paper they built a great team with a great coach, but it's the same story every year with them. Dominant regular season team, and they either get matched up against a top team in the first round and can't find a way to be better, or they eventually fold like they did last night.