In the First KH game it was stated that the keyblade was a unique weapon and that sora was special to be able to weild it at the end we find out that the king also has one (why did he order Donald and Goofy to find the Key if he had one?) later we find out that there are many keyblades and that Sora, The king, riku and Kairi can weild keyblades as well as soras nobody roxas, then in birth by sleep trailer we see a whole ton of keyblades, now number XIV also has a keyblade, in my opinion the keyblade really isn't special, and it certainly isn't unique, now it has gotten to the point where it seems like EVERYONE could wield this thing