Kakko has tremendous balance and coordination which he uses really well when skating.
It’s a bit unique how fast he like can get going from a position where he is standing still pinned up against the wall, only to break out in either direction and with 3-4 strides get infront of the net and around the goalie. That is not speed in the sense of having fast legs, it’s more balance and coordination.
He also got a really good extended long stride that lets him take 3-4 really deep and powerful strides at high speed to maximize the distance he covers, and which he uses masterfully to get a step on a D and be able to lean in infront of him to prevent the D from getting to the puck.
What he don’t at all have is that Michael Nylander-esque ability to on cruise control zig-zag his way up the ice seemingly on cruise control. He can move the puck up ice, it’s not that, but when he does it’s by moving up ice with decieving speed before someone steps up at him which gives him an opportunity to get out of the way and before putting his head down and steam up ice.
That is not a big knock on him, guys built like Nylander and with extreme talent and coordination heads up ice like that. Malkin is more or less the only one 6’2 or bigger that I’ve seen do it the last decades. But it still deserves to be pointed out, and Kakko can also look a little rough in his stride in those situations. I think he has the natural talent to get it done, but he would have to work more on it.