I haven't had any Buttercups and I can't see the tiny comb in the photo but if it's flat with ruffled edges, I'm going to guess that's what you have. They do have tinted legs also and the down patterning looks right. I have had an EE that looked like your chick pattern-wise so I know it's possible but you'd be seeing the center raised (if anything) on the comb and the cheeks are usually puffed in an obvious way.