OK, here's an update from Gibbs (you can listen to his presser
here, starting at around 10:45):
He was asked specifically what the breakdown in job responsibilities would be between Betts and Duckett. His response was:
Well TJ took- last week we had him up on all the short-yardage and goalline, and we'll continue to do that, and NOW I think he'll be in the rotation with Ladell. And the big thing there with a starting running back is that you always want to keep them fresh, and with Clinton in there, every time he wanted to come out of the game with Ladell and give him a shot, we let him do it. And it will be the same way with Ladell and TJ.
He was then asked whether TJ was a good enough receiver to handle the number of throws that have been directed to RB's this season:
Real good, real good. Obviously he's 260 pounds so that'll give you a good pass protector. And I think he has excellent hands. In all of the films we looked at of him before he came here I don't remember him dropping something. I think he could be a good receiver coming out of there and, you know, Ladell is an excellent receiver. So we'll have to see how that combination looks. We'll miss Clinton but it's an opportunity for TJ to step up and do something for us and Ladell has a starting role which is a big deal for him too.
My interpretation: Betts is the starter but Duckett appears to be getting all of the short-yardage and goalline work, and figures to be used liberally in addition to that.