I only watched a couple of recorded playoff games, and it did not appear that Marek played very well with Kulemin. He seemed to have nice chemistry with Kudrna, and the two were quite content to pass the puck to each other. That said, Marek could have helped Kulemin earlier in the season, since I think Kudrna wasn't on the team then. Obviously having a good player on the line is always helpful, even if it's indirectly as there isn't just one focal point for the opposition. As far as the upside, I think 1st line sniper with physical game along the lines of Doan, Cole or even Iginla (okay, maybe not Iginla, since Kulemin doesn't use a visor
) is not out of the question.
Zubov is a good prospect in his own right, based on what I saw and WJCs. He has the smarts and the presence of a superb playmaker, and a pretty good shot, nice skating ability. The closest player he reminds me of in terms of style is Larionov. Very rarely players have that "force field" around them, keeping the opposing players at safe distance while hardly doing anything and slowing the game down. To me he has shown flashes of something truly special, and I would say that his upside is about same as Kulemin, that is a 1st line player. But this type of game is much harder to project into NHL, so his bust potential is higher.
Because of being more of a sure thing, I think Kulemin is an obvious choice here.