In all fairness, the only reason he isn't talked about all the time like Gonz is because he doesn't put himself out there all the time. So all the new kids asked about "the greatest skater of all time" in interviews will reach for someone like Gonz - they weren't around for his heyday, but they are familiar because skate media keeps him at the forefront of our minds.
I wouldn't really say it's fair to call him underrated. If you ask someone who knows to name top street skating pioneers from the late 80s to early 90s, he will always be on the list.