Don't know if he's a legend, but Jerry Fowler. Everyone forgets that he probably invented the nose-grind pop-out that Wenning is famous for.
Now, if you want to talk about certified legends who don't get appreciated for being a dick and pissing people off? Henry Sanchez is arguably one of the most influential street skaters of all time but is often left out of discussions when people talk about Gonz, Koston, Daewon, and Reynolds. The amount of tricks he was the first to do is absolutely ridiculous. He's still a legend and held in high-regard, but can get overlooked because he was only really relevant for 10 years, and for about 8 of the years was coasting.