In all likelyhood he will start as the Sox everyday 2B, I think he's done all he can at Pawtucket for the time-being. Loretta is most likely gone. They're going to need to just rely on Pedroia at 2B and give Lugo (if that's who they get) SS to keep. Lugo would be happier that way and he will probably expect to start as part of signing. He's got good speed, some pop and is solid in the field. If they decide to go with Gonzo then that's fine with me too.
As for Loretta, I think to get Pedroia going you need to have him get as many ABs as possible so Mark would just be in the way. Pedroia should be a high OBP guy like Youkilis so I could see he and youk batting back to back eventually:
Youkilis
Pedroia
Ortiz
Manny (assuming no trade)
Pena
Lowell (assuming no trade)
Varitek
Crisp
Lugo
You end up with guys with good speed at the bottom of the order, giving the sox the ability to make some things happen when their high OBP guys get to the plate (SBs, hit and run, pitchers losing focus). If those guys (Crisp, Lugo, Youkilis, Pedroia) can work their way on then the mashers come up with ducks on the pond over and over again.
In any case you would have 4 potential leadoff and #2 hitters in the lineup.