I wanted to put up some data to provide context to the possibility of a long-term Stuart-Hannan pairing. Is this just a fling or something special? Man, I don't think it's a great idea (and many others have shared their concerns as well). You see it on the ice, and you think, no, c'mon. Man.
Well, I wondered how often we saw it, so I looked at two 4-game segments. One from last year and one from this year. [Quick caveat: Funky TOI data produced >100% in the raw data, but it's close enough to illuminate context.]
As you can see, he mostly did it (played hockey with!) with Stuart, and saw some Boyle on the side. (It's ok, Boyle moved on to be paired with the younger Irwin almost exclusively toward the end of the season.)
Now this season, Stuart has been available to partner with Hannan for four games (~44 TOI 5v5). Here is his pie chart for 2013-2014:
As you can see, Stuart and his partners form a basic (love) quadrilateral. This year, Irwin and Demers have been favored over Hannan so far. So, what is driving this is probably two things: a) Boyle is out, and b) Stuart-Hannan is not something the coaching staff feels the need to lock-in every game.
Bottom line: Hannan was with Stuart 68% of the time in the 4 games last year. This year, when Stuart was available, he's been with Hannan only 23% of the time. Now, I'm only comparing two 4-game segments, so let's keep very little confidence in forecasting, but it suggests that maybe the coaching staff will be line blending the defense with Boyle out, and maybe we shouldn't be worried about Stuart-Hannan evolving into a long-term partnership.