Have you checked how high Taylor went on the high notes on "In The Ghetto" and "Something" or other songs where he did a high "Whoo hoo?" (I know it's not an AI performance, but he goes into a high falsetto on "Georgia" - which you can find via his fan sites.)
Sometimes on Idol it seems like viewers judge contestants' "range" on the basis of individual songs. If you do a Whitney-Mariah show-off arrangement people are impressed. If you two different 1 1/2-octave songs in widely different keys (using a 2 1/2-octave range between them), people say you have "no range."