I could not get a read on what the lyrics meant or didn't mean to the singer just from watching his performance or tears afterwards. My take was that he had huge adrenaline going, spent every last dime of his energy and the aftermath was the release of all the emotion, energy and stress that had built up inside.
Now, maybe the song did have personal meaning as well but how would anyone know that, unless there was some explanation I missed? It's a cooler story if it did, but no way to know.
If he had skipped the scatting and delivered the song with one or two less pyrotechnical runs from high-to-low it could have had an even greater "effect" on us. It still ranks as a very memorable audition, maybe the best on the show. To me though, he was intentionally showcasing his every talent during the song, which detracted 'slightly' from the impact it could have had. That was my only criticism, if you could call it that. Can't wait to se that develop.