I wish peoople didn't try to look too much into his dullness on that day. That poor boy was ill, running 102 deg temperature, stuffed with antibiotics till his throat. I can't imagine myself even standing for a few minutes in that condition, forget singing for the final gala in a competition of that level.
He looked a lot better last night, which shows it has got nothing to do with the voting trend or his hopes dashing, but just that he had recovered considerably form his illness.
That boy is just 19, coping with pressures, tension, fame, high expectations, ambitions, ... and he has been doing that with considerable maturity, against all odds, which even most older contestants seemed to lack.