I'm not convinced that Colin White is a positive asset at this point tbh.
And the Knights won't move Lehner, especially not for that.

Ottawa says "Thank you, Come again".

If Lehner wants to be there

Maybe even if not. Either way, I think they'd look to package him with Dadynov to clear up some more space, not a cheap young guy in Patrick.
If we're thinking about goalie cap dumps, to me the Mrazek one has always seemed the most sensible for the Yotes. They'd almost certainly get a good return for it and he's only got a couple years left.