Instead of comparing the song with the original soundtrack from the movie, if you were to hear his song by itself, wihtout comparisons, you will notice his voice quality. No doubt, his voice can do with some training, but there is no doubt on the quality of his voice..... Even if he does not succeed as a singer, due to his lack of training, he will do exceedingly well in voice overs or even in being a RJ. He has, what I call, a "bedroom voice" 😉