I can see Glendening going for a second with retention or third without. Byron is a cap dump so you’d need to compensate for that and therefore I see this trade as a little light for Detroit.

Byron makes $3,400,000 x 2 Glendening $1,800,000 x 1 So there's no reason for Detroit to retain on Glendening. Montreal still clears $1,600,000 on the deal for then enough to fit him in. Byron+Montreal's 2022 2nd round pick and it's a deal.

No retention on LGD and habs add in a 3rd

I might do this yes Byron is a cap dump but he meets the requirements of a player that must be left unprotected and then we can protect Namestnikov. Then Byron and Neilson are left un protected.

Vladdy isn’t anything special to me and what do you flip him for at the 22 TDL? He went for a 4th rounder last time. I’d rather protect someone like Smith or Svechnikov over him. If you wanted to keep him you can also sign Erne, Glendening, Helm, Flip, or Gagner and expose them.