The issue I have with the RB's is that Holmes is a big ? as far as productivity. Plus, if he gets a slow start the coach has a history of a short chain and yank, back to RB by committee. That is the history of the team and the RB position, plus Holmes has never proven to be a reliable RB.
Therefore, you do not have an alternative to Holmes with Garner and Alstot. Atlanta with with their number one pick to a RB, granted a rookie, but that spells a lot of bench time for Alstot.
Garner is already in a RB by committee situation in Oakland, but will get more touches and TD's than alstot. This is my only concern with the RB team he has.