As literally everyone else has said, Terry Davis.
Everyone shits on Kraut (rightly so), but his ability to synthesize information and present it in a clear way tells me he should gain actual expertise in a subject and be a professor. I liked his videos on China and Turkey and him being able to speak German meant he was able to own Shaun in a thorough way.
Jim has a fairly high verbal IQ, even if he's a paranoid boomer.
I'd argue a lot of the grifting cows have high but either weirdly specialized or "off-beat" social intelligence. They know how to keep people donating to them and keep living without doing any real work, they must be doing something right. Granted, their existence is shameful, but so is the existence of investment bankers and slumlords. I mean shit look at how immortal DSP is.
I'd Like to add JF Gariepy to this list. Despite his goofy speech impediment and his preference for bedding women of lower mental competence (>implying that's not all women). Dude has a PhD in what was it, Neuroscience? That's a major that impresses on med school applications and he's, on paper, on the high end of it, having worked at a prestigious school like Duke.