For the Celtics?
I'd say in the case of a Rondo injury, Ford. He's a better floor general, and he's a lot closer to Rondo's game than Bibby is (although there's obviously a big gap there).
In the case of Rondo staying healthy, definitely Bibby. We don't ask our backup guards to do much, and Bibby would be a fantastic situational shooter.
More or less matches my thoughts.
I think we need Rondo insurance, so Ford makes more sense. If West goes down - you play Pierce at SG some and get Green more burn, use Ford to platoon at PG behind Rondo. If Rondo goes out, you cannot can put Ford in as the starter and leave the rest of the rotation alone.
Bibby would be a better option if C's didn't already have lots of shooters at the wing / guards. Pierce, Ray, West, and Wafer are all good shooters, and if they add Murphy they'll have a big that is a legit threat too.