Jahmene had never mentioned his family troubles until one of the newspapers picked up on it after digging. Chris has from the beginning, milked 'me nerves' and 'me nan'. Jahmene has an exceptional talent, Christopher has to lower most songs to make sure he hits the high notes and often has to begin in a key thats really too low for him (hence the wobbly tones in the first verses).
Jahmene's major fault during the competition has been not engaging enough emotionally with the songs but he totally overcame that tonight. Chris might sell decent numbers of one album but will never be more than a club or cruise ship performer after that.