Thread:Digifiend/@comment-24778794-20160912165219/@comment-691135-20160912171745

Pretty much. So while we'd love to treat them as core members, we have official sources to say they are effectively Sixths. And if you think about it, it would make sense. They have no Green/Black or Pink/White counterpart for Don or Ahim, and when you add in Gai there's 3 Gokaigers for 2 keys and no way to tell which is or should be which. The best way to classify them is to do so as Sixths - and remember from Gokaiger episode 18 that would not preclude Don or Ahim from using either key if the situation called for it, as Ahim used Go-On Silver in 18 despite that being a Sixth Ranger key.