The Globe's Mike Reiss shifts his concern from the defensive backfield to the offensive line.

There have been some "stop-the-bleeding" signings up front in the last couple of days.  In addition to first-year free agent Pete McMahon, two long in the tooth vets were brought in.  McMahon, who played his college ball in Iowa under the tutelage of Kirk Ferentz and OC Ken O'Keefe, was drafted in 2005 by the Raiders, but has never played a down in anger and was out of the game completely for the last two seasons.

Joining him are Barry Stokes and John Welbourn.  You can read Reiss' article here, and I'll leave it for him to put this in perspective.  Needless to say, this kind of juggling on the front does not bode well for the early season.  With Matt Light out this entire time and perennial back-ups O'Callaghan and Oliver Ross recently joining him, things are even more uncertain than I thought them to be earlier.  Here's a run-down on Stokes and Welbourn:

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