Do you believe that the "best decision" in this case is to give Collins control of the backfield, or that it's a better decision to stay RBBC?
Anyone with the level of football knowledge you are ascribing to Harbaugh would have seen, as all of us did, that Collins was the most dynamic back on his squad. This is no knock on West or Allen who performed decently when healthy last year, but from total stats alone, Collins was much more productive on both a YPC (4.59 to Allen's 3.86 and West's 3.54) and a YPR basis (8.13 to Allen's 5.43 -- West had 2 catches to Collins' 23 and Allen's 46 for an 11.5 YPR, which I think is a little skewed).
If Harbaugh is such a winning football genius, and he didn't recognize all last year that giving Collins the lion's share of carries was the right thing given his clearly better efficiency, what makes you think that he will right now?
The only reason I could think of was that Harbaugh and staff are way over cautious about fumbles -- Collins had just two fumbles lost last season in the run game, and another 2 after receptions that were not turned over. So if that's the only issue, and Collins has worked all off-season on it, maybe that gives them more confidence to hand Collins the reins.
But I don't think it's the case. I think Harbaugh likes the fact that he can rotate two backs who performed adequately -- Collins and Allen, and we'll see how Dixon comes back into the mix as well -- and like last year, will continue to do so.
We'll see.