Honestly, this trade could go either way. It could be a win-win. It could be a lose-lose. Either team could win. It's a mystery.
Anyone that says team X clearly won, or player X sucks just shows how biased, immature, or dumb they are.
These are the best types of trades from an entertainment standpoint.
What we know now: Both players are currently overpaid, but Cozens regaining his form / development path and Norris staying healthy negates this. Norris' level of play is more predictable, he's a finished product (good 2-way 2nd line centre), and he is injury prone, one more big shoulder injury from being done. Cozens has taken a step back the last 2 years, and only looked in form when playing for Canada at the worlds. Is it the Buffalo effect? Can his confidence be regained, and get back on the development path? Norris is a much better special teams player. Cozens is a much better 5 on 5 point producer, even in his 2 regressing/stagnating years, he outproduced Norris handily 5 on 5. Norris is responsible, and an above-average defender (Pinto is the Sens shut-down centre). Cozens has to improve defensively, but he's in the right situation, under Green, Batherson, Tkachuk, and Stutzle have become much better defensively.
Will be fun to watch. And I will always like Josh Norris, hope he stays healthy.
One caveat that is good for the Sens (and has no impact on the Sabres), is that without the $ savings from going from Norris to Cozens, there would be no Zetterlund trade, which was a steal, I'm actually more excited about that deal, especially after watching Z's highlight package.