If the Rolling Stone co-founder really believes Marvin Gaye couldn’t “articulate” on the level of Mick Jagger, he doesn’t know “What’s Going On.” — Dear Mr. Wenner, I just finished reading and listening to your new interview in the New York Times, and my head is truly spinning. In fact, I’m still scratching it (my head, not the Q&A). As the co-founder of Rolling Stone magazine, you are an inspiration and a rock &…