He made the NHL at 18 yrs of age before ever meeting Stone, give him, his borther & his father some credit for the guy being as good as he was when he was drafted. Not to mention all of the coaches along the way, sure Mark helped him some in the one 2/3s of a season they were together, but so would have the coaches & other players on the team as well. It seems to me that Mark was getting too much credit for Tkachuk's success when the player deserves more of the credit to me.
I also think it depends on your perspective on this rebuild whether you think Pageau should be traded or not.