Who to Drop? Bush, Sproles, Smith

[j1carr12]

This is a standard league.

I have to drop one of my backup RB's to make room for a WR. Reggie Bush, Darren Sproles, Kevin Smith?
I have MJD and B. Jacobs as starters.

Reggie Bush seems useless in a standard league. He has no points, but his possibility is certainly there.
Darren Sproles can, and has, put up some numbers, and I like having him as a backup because of LT's uncertainty week to week, but therein also lies the problem: LT.
Kevin Smith is an awesome back with a horrible offense. He will be targeted even more now that the passing game is questionable/null.

I feel like Bush is the best of the three to drop. Any suggestions?