And another clue, for me anyway, is that if I can identify a wing-type at all, then I have nailed the primary type. If I can't identify a wing, as with your type 9, then 9 is not the primary type. In my case, the description of the 9w1 just doesn't fit me.
And in the long run tritypes requires a wing for each of the 3 types. But your 9 seems to be flying without any.