The joint that won't close is starting to talk to me

I keep planing a dovetail till it's paper-thin, and there's still this sliver of light at the shoulder. At this point I'm not sure if it's a flaw or the piece is just telling me something, like it has a voice and the voice doesn't want to be shut. Probably I'll leave it as a gap and call it character. Or I'll wake up tonight and hear it whispering from the bench.