Until a trade presents itself (which I doubt will happen), he's a Leaf.
Knowing he's a Leaf still and Berube the coach, IMO not only is he not going to bench him, take him off PP1, etc. , what's more likely to happen is that he's actually going to do some coaching and may even improve Mitch as a player in an all-round sense.
What happens with the contract is going to happen, blame Dubas for giving him the money and NMC he did.
It is what it is now, and him leaving as a UFA seems likely at this point.