This reasoning is kind of stupid. Nintendo never *needed* a reason to give certain games specific subtitles. Nintendo games always had "Super Title Advanced 64" titles that reflect what console they are on. If there is a Pokemon U, it's called that because it is on the Wii-U, nothing more. Having previous titles also having single letters for their titles is 100% pure coincidence.
Asketh Ky to Sol, "Heaven or Hell?" and Sol, being of Gear did say "Let's Rock." Roman Cancels 1:14