The problem with this comparison is that DOC and Puustinen are very different players with different skills who play the game differently. But there's a reason DOC got the bump to line 1 and Puustinen settled in on the 3rd line in the later part of the season. DOC is fast, forechecks hard, and can lay a hit. Puustinen has decent speed and a lethal shot...when he can get into the position to do it as Emp pointed out. It's silly to compare the two but I think we've seen over time that a guy like DOC will last longer than a guy like Puustinen, especially given the biases of our coaching staff. I think one of Puustinen's biggest shortcomings is a lack of battle and physicality. I think that is what will ultimately hold him back. Now, in a vacuum, that's okay because that's not his game. He does find other ways to contribute, but when you're building out a roster, it's very easy not to insert him in favor of others. Moreover, I think it only makes sense to put him in a top 6 role, but again, there are others ahead of him that I would put there (that could change as the season wears on).
Puustinen's biggest opportunity to solidify his spot in the lineup is right at the beginning of the season when they send McGroarty, Pono, Broz, Koivunen, etc back to WBS. If he can get in on the 3rd line and pump a few in, it might be hard to take him out.
I always thought he was more of a wing, but being that we traded our best center for a high-end LW, I don't hate the idea of guys like Poulin and Broz being pushed to center.