That's still just over 70 games. Unless he's got
one of the elite shots in the game, players simply just don't shoot that well over any sort of extended period of time. I realize that he was sorta effective on the powerplay (3 is more than 0 but half as many as Tlusty had), but they all came on similar plays. We saw Justin Faulk score a bunch on that same backdoor play one year, then the next it was shut down almost entirely. I don't think he's some sort of PP specialist any more than Jeff Hamilton was that one year. Also, the difference is that Gerbe piles up the shots while Terry simply doesn't. If he regresses, he will score more. If Terry does (though we obviously don't know what his true shooting % is), chances are, he'll score less unless he plays well enough to generate more shots.
I don't mind him getting a chance to earn a spot. But to just get handed one based on some good fortune in one year? Bad teams are bad because they pay for past performances instead of projecting how a player will do next year.