It's been curious how the Signature Pharmacy thing has led to the slow drip of a name a day (Ankiel, Glaus, and now Jay Gibbons) instead of one big blockbuster of a name-naming story. Here's a crackpot theory for which I have no information but which would make a world of sense:
Major League Baseball itself is leaking the names.
Think about it. On Thursday, it's revealed that Mitchell has a list of 45 guys he wants to talk to. The names came from somewhere, and a list of athletes affiliated with Signature is just as good a guess as any. The players, however, are telling him to pound sand. The very next day the trickle starts. Could it be that someone affiliated with baseball is working the spigot in the hopes that fears of exposure would motivate cooperation?
I stand by my belief that the Mitchell investigation is a whitewash and a sham, and if I were representing players I would tell them to stay the heck away from it. That said, if you were a major league ballplayer who knew his name was on some steroid/HGH list, wouldn't you be thinking that it would be better for that story to break after you had already spoken with Mitchell so that you could release a statement -- and have MLB release one too -- that focuses on your cooperation and candidness? Especially when the alternative is "Neither Shlabotnik nor his agent returned calls seeking comment?"
Like I said, just a theory, but I'm having trouble imagining anyone with a better motive.