I'm not willing to put that ALL on him. Some of it could be Molitor letting him face RHB with runners on. For a specialist like Boshers, the two most important numbers are how he does against LHB and how he does against the first batter he faces (which, in theory should almost always be a LHB). He gave up a homer to a leftie the other day. That's his failure all the way. But, it does happen. Even O'Rourke gave up the one to Granderson last year.
I haven't been able to locate first batter faced data, but I know I have seen it before. It's a very key stat for a reliever. After all, you were brought in to get that guy.
btw, looking at game logs on B-R, one can check monthly inherited runner data. For Boshers: April 1-0, May 0-0, June 7-3, July 2-2, August 6-0, September 4-3. So, he did fine in August. Other than that, not so much.
Nice response. I am still not a Bosher backer, but I appreciate having data to look at.