Not so sure about this Doj. Isn't the Left, non-throwing, shoulder Hanley's problem? He seems to have decent mobility at 1st. I see no reason to expect a dramatic drop-off at third.
I think the fact that Hanley settled into 1st base has more to do with plans that had been made and the timing of Fatboy's most recent flop at 3rd than with his inability to play 3rd.
But I could be wrong. Like everyone else here.
Even if I am wrong, the Sox still have Shaw, Hernandez, and Holt to split duties at 3rd and 1st, LF, and DH to be shared by EE, Hanley, and Beltran.
My idea is valid unless someone can prove definitely otherwise.