She is gone because she had two "clunker" weeks in a row. If it was because she was fat, she would have been in the bottom three at least once before now.
Mandisa's worst perfomance was a hundred times better than Taylor's best. If raising your fist, laughing with your mouth open, clapping and cheering over and over again is talent, than Taylor has it in spades. Otherwise, he's got NOTHING.