The Edmonton Oilers have a problem on Defence that they need to solve

Houston, we have a problem.
The Edmonton Oilers don’t have 7 men who they know that they can count on to play defence for them this season.
In fact, they only have 4 absolute locks: Oscar Klefbom, Adam Larsson, Darnell Nurse and Kris Russell. Matt Benning is not yet at the level of those other 4 but he is a very good bet, so for arguments sake lets say its 5.
I say 5 because as good as both Evan Bouchard (in particular) and Ethan Bear have played this fall the organization knows that neith