It really is all about perception. If it's a perceptibly different color, and it's reproduceable, then it should be pursued. I wouldn't even be messing with it if I wasn't told that several of the others in the clutch had the same odd coloration.

And, of course, it's not even really about the subtle difference in color from an average normal. If there's a Superform then who knows? It might turn out to be cool, or it might turn out to be nothing. There are plenty of minor variations that have an insane superform.