I don't see the Sox having 40 man roster issues.
Even with Pedroia currently on the roster, they still only have 34 players on it.
And those 34 players include Sam Travis, Brian Johnson, Trevor Kelley, and Bobby Poyner. Even if these players were claimed, there is nothing special there. Not to mention, Heath Hembree, Jackie Bradley, and Sandy Leon also still have spots along with questions about their return. And Josh Osich has a spot.
That's nearly a quarter of the occupied slots taken by players who are not coming back or are not difficult to replace.
Counting the six spots already vacant, I'm not too worried if Pedroia has to spend a month or two on the 40 man roster. I also doubt the Sox need 15 spots to add worthy minor league players...