Kyper's always been Team Marner. He's been saying he's better than Matthews for 5 years now, when the separation of the players is getting bigger and bigger. There's a group of Toronto Media member under The Mitch Marner spell, probably because Mitch is from the area unlike those "outsiders" Matthews and Willy who aren't.
Mitch hasn't earned the 10,9m/per the team paid him if you objectively look at it. Matthews and Willy both earned their post-entry level deals, Mitch didn't. Yet Mitch wants a raise.
He's very likely getting traded, its the Tkachuk situation all over again. The agent will try to get Mitch to free agency, but if the leafs just go "we aren't offering you anything. " or "The offer is 7x9.5". Mitch loses the ability to get the 8th year.
Mitch will give the team 3-4 teams he'll sign long-term with. The leafs will send him there for $.75 on the dollar in a trade and Mitch will sign with the new team for like 12.5x8. This has occurred in the past. Treliving already lost Gaudreau, he's not going to do again with Marner.