TM won't put him on the PP right away, he'll have to earn it to bump a highly skilled player like Letestu and Strome off of it.
Letestu has 2+0 and -5(!) in 10 games, and Strome hasn't got too much either. Then there's players like Slepyshev (0+0, -2), Caggiula (0+0, -2) and JJ (0+1, -3), so if it were just about deserving a spot in the roster it would look quite different right now.
The team isn't scoring enough points and the PP should be better, and I can almost guarantee JP would be better than some others on it (playmaking and shot), so IMO it'd be stupid not to try him. At the start of last year he had PP time in a few games and he hit the post several times. When he was taken off from PP the fans wanted him back there for a long time, so it'll be interesting to see what he's got to offer when he gets there.