Can`t remember but did they talked about Black fairy in S1 and S2, was so long ago, or did they mentioned her only in S3?
Another thing, do you remember that on end of S3a, after Shadow goes to Blue, when she recovers, instead of giving the black fairy wand to Charming or Tink that were there with Hook and Neal, she gave it to Neal of all people, that then gave it to Rumple, why did she gave it to neal of the 4 people there?
Blue had long association with Charming, she only meet Bae once, centuries ago, now knowing what was the Black fairy connection to Neal/Bae, we can almost say they planned that, which i don`t believe, but still sort connects now.
"I offended you with my opinion? Ha, you should hear the ones I keep to myself".