Justin Guarini was an early advocate of LaKisha Jones on the recently completed sixth season of American Idol.
Jones, who will perform at The Palace of Auburn Hills Aug. 12 with the American Idols Live tour, finished fourth this season.
Guarini says her demise boiled down to "song selection and not showing enough versatility."
"She's very good at what she does, but you've got to really roll with the punches on 'Idol,'" he said. "It's definitely a marathon. There's a lot of stamina involved."