Riku’s new keyblade is ugly, lazily and poorly designed, and not at all a worthy successor to Way to Dawn.
I really don’t care what made up symbolism you make up in your head about it, nor do I care about your fan-made SPECULATION that it’s a “blank key” meant to transition into his real new one in the near future.
If you like it, fine, but stop pretending everyone has to. It’s lifeless, dull, and not AT ALL on the same level as Fenrir. They literally took a modern house key and lengthened the metal. It’s lame and stands out in the worst ways.