They haven't really played together enough for that.
My own thoughts on Haula and Tuch, to help round out your feelings:
Haula: When drafted, he was considered a top 6 boom or bust LW who had 1st round skills, but was underdeveloped and had an ego. The ego has stayed, there's a reason we call him Haula-Famer, but he's become extremely fast and defensively reliable (enough to shadow Nathan MacKinnon and Pat Kane in subsequent series) and has made a short career out of being a shutdown center. That said, he's also filled in our 2nd line center position before, and went near PPG during the stretch. I honestly think that he'll be a middle six tweener for you guys. If he figures out his consistency, he may be a full time 2nd line center, but the hour is getting late for that.
Tuch: Big body, decent speed, though not the best first step. I would call his skating good, not great. He is smart, knows his position, and has the ability to get open. His shot is lethal, as it is both heavy and has a great release. He gets compared to Charlie Coyle a lot as they're on similar trajectories while also having similar skill and size, and I think that's a fair comparison, though I think Tuch has more goal scoring than Coyle in his future. Aside from Teemu Pulkkinen, who is an AHL sensation, Tuch was the best scorer on Iowa Wild last season. Don't listen if people call him a bust. He's going to be an NHL player.