I'd be really amused if it was Leona, actually. Simon's face would be a picture.
Just picture it though. Last year Simon praised Maria after her You're Beautiful performance. He said that it's not often you find someone like her in the UK.
This year, he praised Leona's Summertime performance. He said she's the ebst female they've ever had.
It wouldn't surprise me at all, actually, if he fixed it for her to leave. All the contraversy and hype etc. would lead to him singing her up and using her for every penny possible.
If this happens, I really should go into fortune-telling...