Sorry for the double post - really have to not hit the post button before I stop thinking. What I'm trying to say above, if it isn't clear, is:
If the gf fiasco happens in Vancouver before the rose ceremony she has 13 guys with her (maybe 12 if she has let one go during a 2:1 date). If she hears about the girlfriends after she has decided who goes/stays (positive these bachelors/ettes know before the pre-rose ceremony) and the 3 she was going to send home are not the 3 with girlfriends then she's got a problem. Can she send 6 home at once - probably not. Does she just ignore the girlfriend thing (?) - unless one of the ones with the gf is Wes (I think we all agree he's made some sort of deal with TPTB) I don't think Jillian would want them around. This means she ends up advancing 3 guys who would not, under normal circumstances, have made it that far. I think this is the only reason Michael makes it past Vancouver, if it turns out that he does.