Board Thread:Movies/@comment-35016591-20180317163813/@comment-4651179-20180317190824

Steve means that he's least likely to die either because he's skilled enough to survive encountering the Winter Soldier, or because even if Bucky is "this far gone," Steve would have the advantage that Bucky knows him.

As for Ross' comment, he's saying that Steve's interference in the operation to capture Bucky cost the lives of some of the agents deployed to take him out. He means that if Steve hadn't intervened, only Bucky (one person) would've died. However, because Steve did intervene, more than one agent died.