adam sounded like a complete Fake Sugar Dick (WARNING, NOT THE REAL SUGAR DICK!) trying to sing man in the mirror.
javier did laps around him, of course javier picked the song b/c it fits his style, adam didn't have to agree to do it. he knew he couldn't sing it but went with it anyways to support javier, so that's prob cool.
bev asked christina to sing that song because it was a dream of hers to sing it with christina.
dia's original song was aces for the radio crowd. she won the competition with it.