User blog comment:BannedLagiacrus/Monster Appreciation Week: Rustrazor Ceanataur/@comment-15446856-20181014150939/@comment-26826688-20181014165937

"re-uses the base concept of an monster in a slightly different way"

All the crabs imitate the monster their skulls belong to. Daimyo and Plum Daimyo charge and do dig attacks like a Monoblos/Diablos would. Shogun and Terra Shogun use their Gravios skull to shoot pee like a Gravios would shoot lava beams. In fact, thats what makes them cool. Their skulls aren't just for show and they actually use them to fight. Weird how you never noticed that.

No other skull in the main series would match Shogun better than the Glavenus, a monster whose gimmick is to slice things and sharpen it's "blade" with it's teeth. You're thinking WAY too hard on why they used Glavenus instead of something else.