We don't know that at all. He had a serious off-season surgery that has ended quite a few NFL careers, and then got injured rehabbing it. He hasn't practiced in pads since last year.

I'd say its more likely he's not even close to being an upgrade over anyone yet.

Putting Ivory in for Ingram is just not as simple as we make it sound.
Payton has intricate designs that call for different personnel packages with each guy.
That's why PT's stuff doesn't look like Ingram's stuff, and the Sproles' "Pony Right"
looks like nothing Pierre or Ingram were trying to do.
Its almost diversity to a fault.
Ivory almost exclusively ran off the edges.
Ingram almost exclusively runs between the tackles (and up his people's back).
KISS. Last time I counted, it was still 5-7 on 4-7 until you put everybody in the box.
We hope Ivory's skill set works well even if the O-line doesn't improve.
I say activate Ivory, PS one of the FBs, and cut a PS body, especially if he looks ready in practice.
That gives us another option and may actually make play action effective.

I think having 4 RB's activated that don't get a chance to get into any kind of game rythem would be a waste of time. That means each will touch the ball even less. Duece got better as the game progressed. I willing to bet any of our backs would have the same effect if they got the ball more. But it isn't the type of offense we run so having a top draft pick that will carry the ball maybe 10 times a game is looking to be silly.

But whatever as long as we win games on that last finale drive as time runs out....