I can't imagine he displaces Arvy, Forsberg, Neal or Wilson. He won't play on the 4th line. That means either Fiala or Smith's spot. I think it would be a poor decision to remove Fiala from the lineup and Smith, for all his lack of production, works his ass off and helps create scoring chances for that line.
Injury insurance more than anything. Rn, had we gotten a top-9 forward injury it would've been Watson or Aberg to the rescue. Parenteau is offensively a lot better than those. Not great defensively which complements well with Jarny and Fish.