>>11508539He was so obsessed with main eventing at all costs he immediately agreed to kill his own angle by coming back to main-event Summerslam rather than trusting the fans to stay by his side and coming back for later in the year. He knew he wasn't gonna main-event Wrestlemania with Cena/Rock on the card, but was so greedy for main-eventing a bigger show than he ever had before, he couldn't say "no" even to his own long-term benefit. He could've come back the Raw after Wrestlemania 28, would've been bigger than ever, would've substantially healed from his injuries, and would be able to leverage a re-unification match and would have much more pull as a star in the process.
His ego's continuously been his death, even when it seemed it helped.