Mandisa was better than Kat. I think Kat stayed because she's better looking, not because of her better talent.
There were probably other factors that came into play. First off she had a couple of bad weeks, back to back. Then there was her lifestyle comment. Then she her gospel song and the crappy clothes choice.
Tell Elliot to avoid any new style they might try to throw at him! lol
Keep in mind that article about how 73% of the voters are women and they aren't so likely to vote on 'sexiness'. The women are going to notice Elliot's sensitivity to the women voted off.
Oh yea, more thing before I go. Next week is Elvis week. That is a good thing for Taylor and Elliot. I think Kat and Chris will have a harder time of it.