DeShaun Foster will be great this year IMO... for awhile
Goings will not be a factor- we only used him out of pure necessity last year.
Shelton clearly won't be switched to fullback as someone posted... however he may have a slight impact early on in the year to spell foster.
It gets dicey with the davis situation. Basically from all indications he's still not ready for the start of the season, BUT when he does get healty(I'm predicting middle of the season), this could turn into him and foster splitting carries, or maybe like a staley/bettis combo... so that's really the only worry.
Bottom line, if foster steps up this year look for him to run with the reigns, then when davis gets back they'll pound both of em' during that playoff stretch run.
Foster is certainly a good # 3 back for your team, and could easily turn into a servicable #2. Maybe around 1000 rushing/ 7-8 tds this year