Anyone else like the idea of anti-heroic versions of the heroes teaming up to form their ownl Illuminati?

you need to have a crazy guy telling everyone whats actually going on to really solidify its secrecy

Why does the Sentry look like Exodus?

Neither was on purpose like Namor.

Considering how little she gets uses she is arguably more of a who than Mask and Medusa

That was just a cover featuring the Illuminati's lovers. That team never really existed