I agree it would be interesting to see if teams are currently playing better than there season average. This can be a tricky thing, however. Possession can fluctuate over the course of a 10 game span (although perhaps not as much as shooting or save percentage), and so it might be difficult to tell if increased possession is due to these random fluctuations or if something has actually changed in a more permanent fashion. Having a couple of games against Buffalo, for example, could lead to a team's 10-game average being higher than their season average. On the flip side, things like coaching changes or the return of key players from injury could perhaps be indicative of a more permanent change, for example. Otherwise, you'd probably have to break down some game tape to see if there really is something different about how a team is playing that's leading to their improved possession numbers. Hopefully, data on the micro aspects of the game will be available soon as the NHL implements some form of tracking technology!