Right, it doesn't work that way. So, why would Neal and Jon put up with the use of tapes at all...for any length of time?? I think Neal wanted Augeri gone long ago. He could have fired him for not being able to perform, Augeri would have gotten some sort of settlement, Neal would have gotten the singer he wanted, and they wouldn't have had the scandal of Tapegate??
Easy answer. "Generations" had just came out and they wanted to promote it. Then the European tour came up - not the time to switch lead singers. They had built up to the fans that S.A. was a good replacement for Perry and most fans (especially the casual ones) had bought into it. ANOTHER replacement would have been devastating on these tours.
Coming back to the U.S. on a high profile tour, they must have known that Augeri had to deliver the goods or a change would have to be made. That is especially true with the allegations hanging over them. Give him a chance to deliver on the 1st few shows and if it didn't work out someone (JSS) was waiting in the wings. Black Sabbath did this very thing having Ray Gillen on deck when they found out early in a tour that Glen Hughes's voice wouldn't cut it.