Exactly, couldn't have said it better myself. Maatta is doing/has progressed extremely well for where he is at. I said it last year: from the beginning of last season until the end of last season, he improved more than not only any other prospect in our system, but probably more than any other prospect in our organization I have ever seen. But he still has a ways to go before he can prove to be able to not only maintain the quality of his play over the course of an 82 game season + playoffs. The Letang injury simply gave us a good excuse to give Maatta a longer look and a bit of experience by inserting him in for up to 9 games. Not to mention the Dumoulin injury....
Speaking of which: Dumoulin looked extremely impressive in both the rookie tournament and what he saw of the pre-season & training camp. Maatta may have higher long-term upside over Dumoulin, but Dumo is definitely ready to make the jump and play in the NHL right now, and to maintain that consistency over the course of a long season.
I don't see the Pens making a big deadline deal acquisition this year, as so many are saying. Last year, we gave away a TON of assets all at once to go all-in, and with 2nd round picks being some of the best currency at the trade deadline (and with us not having ours because of the Douglas Murray deal), I don't see us trading a 1st round pick or top prospect for an established player -- aka a move that would cause a big shift in our cap structure or necessitate somehow creating cap space.
If anything, I think what we will see is a straight-up hockey deal: one of our good young Dmen for another team's good young forward. Or if one of our young Dmen really steps up huge, such as Despres or Dumoulin, and renders a guy like Niskanen or Orpik tradeable, then you could see one of those impending UFA's moved...but again, that would be a straight up hockey deal, either for a younger forward or an older one at a similar cap hit (like a Setoguchi or Chris Stewart deal like we have talked about for a long time). I don't see the Pens doing anything to mortgage their future for a rental again this year, so I don't see the need to create cap space like everyone is talking about.