I really don't think that the 26-9-44 line is going to last very long. Yeo didn't want to break up the PPG line that has been pretty solid since being reunited or the fourth line that has been red-hot. Nino and Coyle played well with Schroeder, a speed guy, who got taken out for Stewart so you throw Bergenhiem, another speed guy, on the Coyle-Nino line and hope that works. All you have left is Vanek-Koivu-Stewart. I think Yeo is more worried about guys like Coyle and Nino changing their games to try and make up for Vanek defensively when they've been playing so well then Koivu.
Also I know there is a lot of Vanek hate on here but he has shown noticeably more hustle and commitment on defense lately. I think ultimately Vanek will wind up with Haula and Brodzy with Fontaine moving up before the game is over.
11-64-29
23-9-44
22-3-14
26-56-21