Even though it may sound anti-climatic to have HHH/Edge at SS w/ Edge winning, it would actually make sense booking wise. Edge already unseated Orton (the long time champ). HHH has been clamoring for his belt for so long and talking about how it is his. He needs to somehow get past Benoit to get his confidence back, but then Edge makes that blow right up in his face when he takes the title immidiately at Summerslam. You have Edge who's pretty much taken everything from Evolution be a transitional champ for about three months where Benoit can stay a contender for a month, Orton can regain the vacant IC title and get his shot at Edge's belt, and HHH will probably take the thing at SS.
This gives us three champs for the year and Trips can say he is a 10 time champ (or is it 11?) without keeping a stronghold on the title all year.