It absolutely kills me to see how far OEL has fallen. But I'd still like to see him under a new coach before moving him.
I have that take for Keller, even this year he looks a bit better. I'd move on from OEL with almost any deal that brought in a roster piece, modest futures, and allowed us to avoid retention.
OEL was starting his decline even before the narrative about the bad season with injuries and his mom passing. He's either checked out or has too much wear on the treads.
EDIT: Hard to say without being the room, but I would probably consider stripping him of the C and seeing what happens.