I don't know why he wouldn't play the piano if it's part of his performing arsenal. If he truly intended to use American Idol as a means of getting his foot in the door and attracting interest from industry types, I would think he would do everything in his power to demonstrate his prowess as a musician on the piano and publicize these supposed abilities as a songwriter. It makes no sense to hide that potential or bill yourself as a partial package when you're in a position to impress.
