Here's the link that says they practice with all of the singers on Tuesday. The Tuesday show we see is taped on Sunday so the Tuesday practice actually refers to the songs the bottom 3 have to do on the Wednesday elimination show that is taped Wednesday afternoon. http://www.inxs.com/index.php?section=news&page=home&id=455
I was reading through some of the blogs and diary entries on the INXS site and the band seems to both like and promote mention Jordis, Ty, Marty, Suzie, and JD most often. I don't recall seeing Deanna, MiG, or Jessica mentioned other than to say that they really did think Brandon would do well with the song assigned to him and that Jessica was thisclose to being eliminated. I tend to wonder if they'll eliminate Deanna the first time they get the chance.