I will admit that I don't have it explicit they've met prior (Timeline, is there a timeline for the non Marque events?) but it's only implicit that Sam and Rhodey are meeting in Steve's recovery hospital room. (Which, canon, I can't tell if MCU acknowledges they must have met not just at the Age of Ultron party pre-Civil War).

Since Ross explicitly calls Erik one of the CIA's wetwork, yeah, he'd at least have heard about the Winter Soldier. And it would play into his post-D.C. plans.

Pushes Eliot Spencer into the room and locks the door.