The upgrade from Gregor/Ostapchuk to Zetterlund more than makes up for the potential downgrade from Norris to Cozens for this year's roster, and in the longer run things will depend on how Norris' shoulder holds up.
I'm still sad that Norris is gone, especially given how much chemistry his line (finally!) showed in that last game against Chicago. I'm amazed at how productive Norris ended up being this year for us despite his hesitancy at using his lethal one-timer. When he used it, it worked even though it didn't look as deadly as it used to. If he can get back to his pre-injury form, we might regret the deal, but conversely if his shoulder becomes a problem again, we'll be relieved he's another team's problem.
Also, I just don't know enough about Cozens to properly judge the deals. But all he needs to be for us is someone who belongs in our top 6 in some capacity or another (centre? winger with a shot? dude who learns to use his size AND has puck-handling skills?). In that case, next year between Cozens, Tkachuk, Stutzle, Batherson, Perron, Zetterlund, Greig and Amadio we have 8 guys our of our top 9 figured out, AND we may still have room for Giroux if we want to bring him back.
Crazy that this was a trade deadline deal that not only improved our team for the short term but may also have extended the window of contention (or at least window for making it to the playoffs) of this core by a year or two. How often does this happen?