Actually I find it surprising and somewhat funny that Morrison/Benjamin has actually had more buildup asfar as physical confrontation and promos, than BOTH Jericho/Mysterio and Edge/Hardy and Punk/Umaga... Edge and Jeff have rarely been in the same ring unless its the end of the show and Jeff comes in for the attack.. Jericho/Mysterio really only started last week after they teased Jericho/Morrison the week before and Punk/Umaga have had virtually no interaction apart from Umaga stopping Punk from cashing in his briefcase.
With that said i'm going Morrison/Benjamin... Morrison actually beat Benjamin the same night he brawled with Jericho.. Shelton then screwed Morrison out of his match with Jericho on Superstars..Then Morrison defeated Charlie Haas.. He punched Benjamin in the mouth after Shelton's match with Rey on Superstars, and then Morrison and Punk defeated Haas and Benjamin on Smackdown... So, with all that being taken in to account, I think its safe to assume Shelton's getting the pay off here with a victory over Morrison seeing as how he's been punked out three weeks in a row now...That is, if they continue the feud.. If this is the end of the feud, then Morrison will go over as this feud is designed for John Morrison to go over.. So if Shelton wins, expect this feud to continue.. If Morrison wins, the feud is done.
As for the person who brought up Edge/Jericho...I think you are right in a sense that it WILL be Smackdown's biggest feud when it happens.. However, I think WWE will hold off on that.. I think, what they did on Smackdown, was test the waters for the Edge/Jericho feud.. THey wanted to see who'd get the bigger face pop so they could decide who'd turn face for that feud and by the looks of it, Edge is the unanimous choice as he got about 90% of the cheers last night...
On top of that, Jericho requested a lengthy feud with Rey Mysterio.. And it seems like hes getting the IC Title at Judgment Day and I doubt Edge is going to lose the World Title and then decide he wants the IC Title... I think Edge/Hardy will stretch out a lil longer as will Jericho/Mysterio...Then, after that's done, Edge maybe ready to turn face if Jericho doesn't feud with the Undertaker at Summerslam like was planned when they drafted Jericho to Smackdown....I've been waiting for an Edge face turn since he lost the World Title at Wrestlemania and Vickie became Raw's GM..It'll happen this year, i'm just not sure when.