Just looking at some team stats on NHL edge.
We are currently below the 50th percentile in terms of bursts over 20 mph. Even our top skating speed is "only" 64th percentile. But we are in the 99th percentile in terms of distance skated. Not sure how that is squared.
We are also below 50th percentile in terms of ES offensive zone time, which I imagine is due in part to protecting leads.
Anyways, despite the success, I am a little wary of our lack of speed throughout the lineup. Not saying we need to add speed, but If we were to add players, I would prefer they can skate. We see how much an effect our fast fwds have in late game defensive situation. They can't all be fast little guys, but sprinkling them in has clear disruptive effect on opposing teams. Bringing in another slow guy, such as Kakko, I think may be swinging that pendulum too far the other way.