Ryan should be three. Number one should be whomever Baldelli is least likely to get antsy about pulling after five. Until the All Star break, I thought that would completely eliminate Gray, but he's gone six innings or more in seven straight starts, so I'd lean toward him lead to things off.
Even if he doesn't like it, I'd like to see Maeda as an early-pull replacement out of the pen, like the Dodgers used him. If Baldelli gets squeamish and pulls a starter early, like he (and Molitor and Gardy) has done in the past, I trust Maeda in that role to keep the team in a game more than Ober and Ryan, and much more than most of the other bullpen options.