From what I read:
It is an RBBC. If Green comes back, it will be him, Gado, and Herron splitting carries. (Hopefully more Gado and less Herron). Henderson will be slowly phased out in favor of Davenport, who may also spend part of the season as the league's only FB/KR.
Now that's versatility. Davenport is a HB only if Green doesn't make it back on time. Either way, we've got a pretty solid running game. Too bad we have no line, or Favre wouldn't have to pass at all, and we could effectively end the turnovers.