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You could give the two SP/RP's a trial run. With the Bartender they kinda tried it last year; on July 18 for example he had a 4.0 inning appearance, 1-hit shutout, 4:0 strikeout to walk, threw 95 MPH on pitch #50 of the game.
You can quibble about it, but we got something of a look at him as an SP last year. He would probably sit 94 MPH as a starter.