The way the FedEx excess system works -- no bump and flush --encourages multiple excess bids imo. If people don't bid where the company wants them to go, they hold another one etc until the system looks like whatever they think it should look like. So it isn't exactly stretching things to think there's going to be more (maybe several more) excess bids.

Not that any other system of dealing with too many bodies for too little flying is any better.

But that's just my opinion, I've been known to be wrong.