I don't know man...you're right about the flair that Kone has that Priso doesn't. He has a swagger/bounce to him that you see.
But I don't agree that he's more in an attacking role than Priso is..(I think that's the swagger). I think they both are box to box midfielders who's style is to break up plays and get the ball forward. Which they both do, they just play in different systems.
Keep in mind, Montreal has deployed a 3-5-2 all season, and Kone's primarily played in the DM position alongside Wanyama, with 3 guys in front of him and when Piette re-emerged he's sometimes played with all 3 in the middle. Those two guys are both midfielder destroyers. If you really take in Montreal's personnel it's a very defensive team, which has allowed Kone to be more free/express himself. It's the reason he has double the amount of turnovers than Priso.
Whereas with TFC, Priso was played in the holding position with the expectation to play short passes between Osorio, Delgado, Pozuelo or Bradley, while staying safe in the belly of the field. Being the last man before the defence.
Compare their stats, they have near equal minutes...you'll be surprised to see that there's not much difference.