Originally posted by dylbagz:[..]
it should still open... just to get energy levels 150%
Ya but after u open with that what do you do? You've now played you're best song and have no way to replicate that energy level for the rest of the show. Its like Springsteen opening with Badlands on his most recent tour. First song rocked it out and then the energy hit a valley until Born to Run at the end of the main set. U2 doesn't have another song equal to Streets to play later.
This is all very off topic but it basically comes down to how you construct your setlist and show to provide the best experience, flow, and build for the fans and the band