C'mon man, and I say this as a guy who knew and used to like Mittlestadt, a lot. He has got slightly more value than Alex Nylander at this point. He has been nothing but a disappointment year, after year, after year. Offering him and a pick in the mid 20's (at best) for Fiala alone is bad, nvm asking for McBain on top.
Mittlestadt simply doesn't move the needle much at this point. He is a reclamation project, with an unproven skillset and an inability to withstand the rigors of the NHL. On top of that, MN aren't able to take on his contract...I think they would rather pay Nico Sturm that money frankly. Gaudreau isn't a great #3C, but he can win a FO, skate, and play D, all for 1.2M. CM costs over twice that much, can't stay on the ice, and when he does, doesn't produce. MN isn't going to pay for the "privilege" of 50% retention on him.