Seems like the Flyers are taking the bull by the horns with their Euro picks. They don't really have a recent track record with these guys due to the lack of picks, but it will be interesting to see how it plays out. I think the last thing they want is Hagg and Pettersson rotting away playing 10 minutes a game with no special teams work. At least you can manipulate their ice time when they are in your system.
Pettersson's not really an offensive guy, but I'm sure they would like to try him on the PP before they dismiss him as that kind of guy. I mean you're looking at Gostisbehere (if/when he's there), Hagg, Alt, and Manning and no one else that really merits PP time. I don't think there's a ton of upside, but you need to find out.
I think if he becomes a Francis Bouillon type player, that would be nice haul. Short, stocky, gritty, blocks shots, can handle the puck a little bit, 20 points max. Bouillon has played almost 800 games in the NHL, so this is probably a best case scenario, but I think he's got the tool kit.