Ehhhhhh. I dunno. Shipping characters because they look good is a legitimate thing that happens, but for the most part, it's all about the characters themselves. Just because you don't see it (or in a more likely case, ship something else) doesn't mean it's not there at all in the subtext - if you want to read their relationship that way. As an example, in the Ace Attorney series, the biggest ship is Phoenix and Edgeworth. Now, I personally have never seen it. Still don't. I have never read their relationship in such a way. But many people see ~something~ and that's fine. I imagine that it is the exact same situation here.
Either way Fang and Vanille is the correct ship so w/e