Because the OP didn't mention whether his Kempo instructor taught him how to fight or not.I don't know where that question came from, but what you're responding to is the answer to your question of who has learned an entire MA system. If you hold an honorary dan grade (really, the highest technical grade), it's because you can perform any kihon or kata in your system on the spot if you were asked to. Well, at least in theory (I added the "in theory" part to keep Dirty Dog away).
In MA, I don't care about whether one can demonstrate a form, or know the history, I only care about whether he has developed any combat skill/ability.