It's important to note that Q isn't really special other than the fact it caught on. People claiming to be insiders and sharing secret info was a common trope on 4chan. People constantly lied about being Apple/Google employees, federal law enforcement, etc on 4chan and made bold claims about this or that secret project.
I can't recall the exact episode, but the QAA podcast discuses this in one of their interviews with Fredrick Brennan. Brennan himself admits to doing these kinds of "insider anon" trolls in the pre-Q days. It was absolutely routine for people to say they were feds or whatever and had secret info. The whole culture of 4chan is toxic weirdos trying to play tricks on eachother and the wider public.
For whatever reason, Qanon exploded in popularity rather than following the normal track for these anonymous ****-posters. It escaped 4chan into wider mainstream social media, where gullible conservative boomers that were unfamiliar with chan culture swallowed it hook, line, and sinker.
I very much doubt the original Q anon poster was anyone special. In all likelihood, he's just some 4chan ****-poster that managed to land a whale.