If Marner decides to leave and we replace Rielly too, how about acquiring:
Kadri (7 million)
Provorov (7 million)
Provorov give us what Rielly gives but is a notch or two better at this point in time.
Kadri is showing no signs of slowing down. He just scored 33 this year. 75 points last year. He fits the timeline. I'm sure he has, at least, 3 years left of productive hockey. Gives us really good strength up the middle with him and Tavares flipping between 2c and 3c. He loves Toronto and gives us more of the grit/attitude we need to go deep.
Of course, Kadri would have to be acquired in a trade. Maybe Rielly? Calgary is close to home.
If Marner gets 14 million, then we still have some money left over to get a top six winger, like Boeser. Especially if we dump some more contracts.