I am hoping that I am wrong on this but I was thinking that maybe Smith told the Front Office that this is his last year. And then asked if they could hang onto to him just in case he could get back on the field one more time before calling it quits? Again I hope I am wrong but it would not surprise me.
I read somewhere that the reason they aren't rushing him back is that they believe he has a good 2-3 years left and they don't want to bring him back too soon, only to be reinjured, and miss camp next year or worse early next season.
That may just have been some sport writer's opinion though so take it for what it's worth. You also have to figure if we win the next two, with the week off before the super bowl, it would be an extra month off for him and he might be ready.