I think the words "the dancer you most want to win" were used right at the beginning of the show, so not necessarily the best dancer, but the one YOU want to win, and Jay must have this really big following which probably made him favourite from the start. I must say I enjoyed his gracefulness, but all finalists were good (except perhaps Anton and Katie who were a lovely couple, but I think Anton is not as young as the other dancers, and prefers the old routines which he does really well, and he got the votes because people appreciated his good humour).