You're kinda in a bad spot here as far as RB's go
First things first, Branch you have to start.
As far as Ivory/Bush goes.
Ivory is the lone-back (If Reggie doesn't play) going against the #1 run stopping team.
Bush is the secondary back going against the #2 run stopping team.
This is probably the only time I'll ever say this, but starting Tolbert in this position would probably be best, and then start Evans.
10 Team league 0 PPR 14-1 so far.
QB: RGIII, Romo, Bradford
WR: Lloyd, D Moore, Ogletree, D Thomas.
RB: Foster, MJD, AP, A Green, D Richardson.
TE: Fleener Gonzalez
Def: Waiver Matchups (NEP)