Define "full time."
If the team was convinced he'd be worth the time and money, it wouldn't be a 1 year deal. This is a gamble. Could pay off brilliantly, or he could get hurt in Spring Training and never see a pitch in a Boston uniform. Just don't pretend that we can expect to see more than about 100 games of Stephen Drew, if that. And if it turns out to be less than 80, then "full time" is at least a stretch. And if he hits for crap and can't defend the position, and another option makes itself sufficiently viable, I expect to see this gamble abandoned by late June.
This isn't a signing they're going to try to count on to contend. What this signing signifies is that the Red Sox are willing to eat some money experimenting until we're ready to contend again. Which is the right move, since experimenting landed us David Ortiz. On the other hand, it also landed us John Smoltz. Two sides of that particular coin.
Point here being, people need to not read too much into this signing fron a trying-to-contend standpoint. Yes they areat least failing to wave the white flag right out of Spring, but this signing will ultimately be judged by the fact that it was worth a shot, and if we get 1 year of a decent shortstop out of it, so much the better.