Think back to X & Y, where the Mega Evolution helix was featured on the Japanese logo, but not AZ's Key, which was much more important plot-wise. This makes me think that, whatever those diamonds are referencing, it's more likely they are something related to a Pokémon rather than a person. It would be cool if they were related to a person but, again, it would have to be something relevant, too.
While it's an obvious coincidence, it would be cool if Colress makes his appearance in Sun and Moon. Even better if he's our regional professor for these new games!