The Leafs don't need young D-men who we have to break in at the NHL level (he's looked good but its 23 games). This trade makes almost no sense for the Leafs. If we are parting with assets like this, it needs to be for a long-term RHD who can immediately be plugged in next to Rielly. If we can't get that for this package (which is a fair opinion), we don't sell it for a young guy who we hope develops into that role, we just hold firm.
While Babs likes Glendening, I'm not sure paying our 4th line center 1.8m for the next 3 years is ideal with how we have to maneuver the cap.
Now, considering the Red Wings D, I also don't see them too intrigued on moving one of Cholowski or Hronek for anything but a dramatic overpayment. So, while not "untouchable" they are highly unlikely to be moved, especially in a package that doesn't return a mid-20's D man of higher stature (for example, I could see them in packages to land a Parayko).