I imagine Benoit will stay on the roster until the end of August, and probably the end of the season. He might not be pitching in the eighth inning, but it's not like the Phillies have a surplus of effective relief pitchers, here or in Allentown. He's a body, and he's not actually awful, he's just had some memorable bad outings. I mean, he's not great either, but his WHIP is lower than Neris's, for instance, and he strikes guys out more than Garcia.
And you never know, a team gets hit with an injury on August 20th and suddenly his experience looks good, especially in the AL.