I read with great interest this article on Bellhorn. As the days of August tick by and the Sox having some uncertainty at a number of positions. I would guess that the Sox will play a few games with the Roster right around September 1. We may see some mysterious injuries in the week before (one of the kids, or a Gonzalez, Dinardo maybe even a Youkilis). Some rehabs prolonged (Foulke, Olerud, Bellhorn).
With the rosters set to expand September 1, I expect there will be at least handful of callups. And, of course, the playoff roster has to be set using players that are active on September 1 or on the DL on that date. The only exception to that is if a player is put on the DL after that date, the team can add on player - this was the K-Rod exception from 2002 when they moved some crappy pitcher who had already been on the 15 day DL to the 60 day DL which opened a spot on the 40 man roster for K-Rod.
But to give the team the most flexibility in roster management for the playoffs, it is in their interest to have a few options. And having players on the DL creates such opportunities.
So I would guess we will see some strange stuff in order for the Sox to give some players more of an audition for a post season roster as well as a chance to create a roster that will give them better matchups.