I'm not sure I understand the issue at all. White has been inactive. White will be active. It really is that simple.
IMHO, we should have looked for veteran back in the preseason, someone who would be inactive absent any injuries. In any case, Belichick likely prefers Bolden to those players who are available, although a trade is always a possibility.
BOTTOM LINE
Our "norm" for this year has been to use Ridley, Vereen, Develin and Bolden. Now, we will have White instead of Ridley. Certainly, we have to expect our highly drafted to be our #4 RB (and to compete with Bolden for reps).
I would be fine with us looking for a 5th RB, so that we wouldn't be crippled if someone else had to miss a game or more. Perhaps that player is Gray. If so, I would activate him to protect him against someone else picking him up. Gray certainly flashed a bit in the preseason.