Firstly, yes ok, Leona and Alexandra havent done too badly out of winning X Factor, but not winning the competition isnt necessarily a bad thing.
We've got JLS, Rhydian (whos new album is doing well), and Susan Boyle (yes she came through BGT but its the sam principle). Alexandra Burke got knocked out at bootcamp 3 years ago and came back to win, and theres massive new pop artists such as Little Boots who got knocked back years ago too.
Some of the winners of X Factor are now nowwhere to be seen, including Leon Jackson, Steve Brookstein and Shayne Ward. Where are all these people now?
Leona is by far the biggest success story, but by not winning X Factor, Danyl Johnson has probably gained more credibility and long-term success. This time next year I wont be suprised if he has a hit single and a hit album out. Then Danyl will really have an opportunity to show his stuff.