I have to confess, I can't stand "Moon River". Too old-fashioned for me, although there are other old songs I quite like, but this isn't one of them. Here's an old song I like (written mid 1800s):
I find Rayvon and Clark technically good, but very boring singers. There's a spark missing there.
Really, it would have! He's been on the show long enough to take that exposure and run with it. He would have gotten quite the publicity over it, too, and it would have been true to his "just telling it like it is" persona.
I have little to no filter, myself, but know enough to spin it as both my greatest strength and my greatest weakness.