IMO Mateo is close to as good as McKenna in CF and Mateo hit lefties last year. I think McKenna is DFA'd before OD. Neither McKenna nor Mateo are on the team for their bats.
The 40 man roster is at 39 since they put Bautista on the 60 day IL. I think Elias will DFA Nevin, Maton and McKenna and tries to get them to AAA. Nevin is the only one of the three that I see getting claimed.