Luke Skywalker vs. Valkorion, Vaylin and Arcann

Who wins

Luke considering he is in his peak. Arcann and Vaylin aren't factors to this fight.

Luke.

Luke.

Arcann and Vaylin get ragdolled then Luke beats Valk.

Luke in a great fight. Arcann is fodder so it boils down to Valkorion and Vaylin. Vaylin is around ROTS Sidious level at best so she'll go down fairly quickly, but Luke vs Valk will go on for ages and be a very close fight.

Luke is powerful enough to win, but I just can't see him prevailing here if they all fight in-character.

Yeah, Luke loses before he realises what danger he’s in probably