Are you being obtuse on purpose? You don't see the benefit of holding onto him, reaping the benefits of his productive play and chemistry with Gallagher/Danault next season, and then having the option to trade him for good value next year?
I mean, sure, if MB gets his quote then obviously he would be open to trading Tatar. That quote being a 1st + Cayden Addison type of prospect (with capdump). Otherwise, MB is happy to hold onto him. That's the luxury of term on this contract.
You do understand what that means right? An extra year on his contract?