I would not trade OEL for any reasonable return if I had to retain even 12%. Russell is fine. Chiasson is fine. Even Kassian. No retention on OEL and NO Neal!!!
I wouldn't take any negative deal with term. Kassian and Neal are deal breakers, imo. I don't need to hand you a top pairing D and fix your bad decisions for you. If you don't have cap room to make deal and need to move guys out, go do that and come back from a position of strength.
Guys like Chiasson and Russel are the sort of guys that get moved to shuffle cap. Chiasson is essentially value neutral. Paid a bit too much. Is still a useful player without term or obscene salary. Russel has a bad AAV, but his salery isn't onerous and he has no term. Both fine for shuffling money to accommodate deals with us or someone else.
Or a package that includes Larsson, Nurse, or Klef which moves useful players with decent AAV, salaries.
I don't think we have to take someone's problem to move OEL. We might have to accommodate a deal by taking salary/cap back, but we don't need to take on Neal to make a deal.