Personally, AEG is a very successful developer and operator of stadia and arenas internationally. They were also committing a significant amount of money to the deal themselves ($59 million). So they not only have far more extensive experience in this area than the anyone in the Kings organization, they were also putting their own money at risk.
In other words, I don't think AEG was going to inflate revenue. They were depending on this deal to work financially, too. The major issue for the Maloofs, that would not involve AEG, is the refinancing of the current city loan in 2015. And the Maloofs are certifiably insane if they think any lender is going to loan them $67 million without collateral. Certainly, no city could do that. I wouldn't either with there credit history on loans (Palms need a workout or would have gone to foreclosure).