Last night’s Cycle 10 opener ended with former child actress (and former drug abuser) Alisan Porter stepping up to sing “Blue Bayou,” and sparking a fierce battle among three of the judges. Porter eventually selected, as her judge and mentor, Christina Aguilera, which may set the stage for a female judge finally to win a Voice competition. It’s still early in the audition process, but Porter sure came out of the blocks with an attention-demanding debut.