I don't think so. Neither of them will be on the starting lineup and Winker brings nothing in terms of defence and baserunning. Mitchell does. There are doubts about both surrounding how they will hit, but Mitchell has other skills while Winker relies purely on his bat.
Chafin has me torn. On the one hand, you are absolutely right that we don't need 2 long relievers, but maybe CC could use Wilson in more of a one-inning role and Miley in long relief? I am just not confident in Chafin in any situation. Chafin is a lefty though, and only carrying one (Milner) feels foolish.