Care to explain what are these arrogant comments you've been hearing? Hopefully they aren't from the same source who told you Kiprusoff was arrogant and a problem in the locker room.
Not to mention, since when being slightly cocky became a bad thing? Everyone (including you) liked how cocky and confident Laine was during his draft year but apparently with Kakko that kind of thing won't fly anymore.
I think you are looking too much into Kakko holding onto puck like it's a bad thing (and suddenly not remembering how much Laine liked to hog the puck but as usual I don't remember you critizing him much about that). With Kakko you have to remember that he is one of the best players ever from Finland when it comes to hands and controlling the puck. Of course you want a guy like him hold onto puck as long as necessary instead of just immediately giving the puck to the blueline where your average Liiga defender just shoots it to the first player blocking it.
I mean, we all should expect that Kakko won't be holding onto puck as much when he gets players as good as him next to him. Or is there someone in the NHL whose career didn't pan out because he liked the puck too much and couldn't learn to pass it? I'd rather see Kakko learning how to play less with the puck instead of him learning how to actually play with the puck. It's way easier to learn how to play less with the puck.
And finally, I'm not sure how much you have watched Kakko but there have been plenty examples of him showing him being capable of fast give and go-plays. I don't see how that could be a problem for him.