Finally! An answer to your question from the man himself. As I assumed, he did not "pick" a name.And, fwiw, I still totally disagree with the first part of your post.

“Music has been my best friend my whole life, because music doesn’t betray you.” - Lukas Rossi
Well...he did kind of pick it. But not totally, and not out of the ether.I will say that he has definitely grown a personality since the beginning, and has been great the last couple weeks,but 4th place is the best I can see him getting.
And the "other" one, Ryan Starr, did totally pick her name, but it wasn't in the "third or fourth" episode of American Idol, I saw her first performance and she had already invented her name.
His is at least half-given, but since he became "famous" second, it's his cross to bear.
I couldn't remember her changing the name on the show either but I thought his comment was cute. *fangirl*I'm not sure if he became "famous" second or not. I'll do some back checking but I'm pretty sure he was "famous" before AI even started.

“Music has been my best friend my whole life, because music doesn’t betray you.” - Lukas Rossi