Yellow Sweater

I've been working on this sweater for (checks Ravelry...) almost two years. It's a bright yellow Flaum from Amirisu, and I think it's going to be amazing. It's hard to try it on because the hemline is so much longer than my needle, but I think I'm almost done. 

So far, it's gobbled up six (mismatched) skeins of Cascade 220 in all of that squishy fisherman's rib, and I still have a little bit to go. My question for you is, do I get another skein of yellow and hope that it mostly matches? Or do I finish the ribbing and the tubular bind off with a pretty dark grey from the stash?

Thoughts? I'm leaning toward the grey, but I'm open to ideas.