I believe you, but if that's true it's really not smart by Don.
He has to do something to a) cut cap b) either begin the rebuild, or go for it, or try a middle ground move
He HAS to trade someone, and really he should be open to trading any player if it's the best move and making up your mind about 1 player over another before you've explored all options isn't smart.
If Ullmark + the return for Swayman > Swayman + return for Ullmark then you do it.
Hey man, put me in the "every option is worth exploring". We're all just discussing things here. No reason for anyone to get angry or treat you like you are dumb because you have an idea.