I think special guests during 2 songs is enough for a 13 to 15 minute set. Adding more guests would be too much in my opinion. They should have done a better job of keeping Alicia Keys a surprise since I find her appearance a little less predictable than Ludacris and Lil' John, since "Yeah" is a no brainer. But since I think what should be all of the guests have been revealed, he should focus on making his solo parts the wow factor.