Interpretation of an Endwalker Plot Point (Spoilers for the Entire MSQ)

[Vyrerus]

That doesn't matter in terms of Intelligence by said definition.

in·tel·li·gence

/inˈteləjəns/

noun

1.

the ability to acquire and apply knowledge and skills.

Chai Nuzz has his wife though that gives him good back cracking =P and no longer needs a chiropractor lol

I'm also convinced that Chai's wife is Jessie so that may count for something somewhere

I've got:

Intelligence -

1. capacity for learning, reasoning, understanding, and similar forms of mental activity; aptitude in grasping truths, relationships, facts, meanings, etc.
2. manifestation of a high mental capacity:

3. the faculty of understanding.

There's no instances of handing Chai-Nuzz a great scenario of knowledge outside his Talos expertise. Giant Talos still a Talos. Cid on the other hand? Magitek for days, son! The Aetheric Ram in HW. Alexander. Omega's alien tech in Stormblood. Aetherburner in Endwalker. Time travel in the 8UC timeline.