The last time that Constantine Maroulis trod the boards of New World Stages was in 2008. Capitalizing on his dynamic American Idol appearances, he was cast as the hard rocking Drew in the ’80s-themed jukebox musical, Rock of Ages, a part that he would parlay into a Broadway run. Now, as the title character in Rock & Roll Man, he has returned to the venue, with shorter hair, to lead another period musical that’s full of classic hits. But this time he leads from behind, supporting a sensational ensemble that steals the show and never gives it back.