I like to think that he''d have stayed dead if they'd left the body in the main DCU, but when they took him back their local rules about such things reasserted themselves.

Love Lil'Dick's cluelessness about what "death" is (One assumes his parents are now recovered from the stress of someone stealing their ladder so they couldn't reach the trapezes to perform as the Flying Graysons), and Lil'Bats gleeful smile at getting his buddy back.