I don't think Granlund will ever really become an elusive skater. I think it's an underrated skill, as is skating in general. Mikke already improved his speed and is now NHL average in that department, I'd say. I don't see much room to grow there at 21 years of age. It seems he is now especially focused on getting stronger which is wise as there he has potential. He is a naturally stocky build so he should be able to hold his own on the board battles when he grows into his "man body". He has the right attitude and great work ethic so I'm confident it won't be an issue much longer. His stocky build also prevents him from ever being a ballerina on the ice so it's wiser to concentrate on things where he has room to grow. Kane is a skinny build, those type of guys can dance around on the ice.
I'm sure the confidence will come back when he finds out he can do his thing in the NHL too. I remember when he played with supreme confidence the whole year 2011 pretty much, and he looked unstoppable at times.
I agree 100% that Granlund's skating has and will hold him back, although I don't think it's his build.
Skating is something that just cannot be overrated in the NHL. Granlund's lack of success is almost completely that his skating is below average for NHL players and well below average for skilled players.
Kane is one of the most elusive players on the ice but also has the speed and puck skills, that's why he's so dangerous. Datsyuk is incredibly agile and does have above average speed. If you are undersized, you HAVE to be above average in terms of speed and agility. Otherwise you are a Pierre Marc Bouchard, just a hair too slow to be a breakout star and prone to injury.
Look at the success of Brodin this past year, obviously he's extremely high hockey IQ and has crazy amounts of composure on the ice, but it's his skating that allows him to get to the puck first, defend 1-on-1, skate the puck out of trouble, catch up on the backcheck, etc.
Granlund has ELITE hand-eye coordination and puck skills with above average wrist shots and creativity. But he has below average speed. His ceiling IMO is PMB unless he somehow finds a way to improve that skating dramatically. Something like a second or third line winger who needs to be paired with a faster two-way forward who can crash the net and draw defenders.