They could do whatever. They could add big show, my opinion is what i think is best for the company. There are a few stars knocking on the door who could use the 2-3 months heel role before moving to face long term, also setting up a shield angle vs him when ambrose comes back. I am only stating what i think is best, and current star joining with the shield just doesnt work, in my mind.That doesn't mean someone has to take his place by joining The Shield. Reigns and Rollins can easily work while Ambrose sticks to talking. Or in six man tag matches, Ambrose can just spend less time in the ring. It looks like this 'injury' isn't really that serious anyway. It's not like he has a broken ankle or leg or anything. It also makes them look silly in a way if they request the help of another star only to kick him out afterwards. I mean, if this new member really was so effective, I would think they would keep him in the group.