He 100% earns a place in that ring of honor, but the difference that stands out is that Bob/Fred were the drivers/content of their efforts, where Levar was an actor, cast as host of a show. There is probably a quiet, nameless driving force behind Reading Rainbow that doesn't get the credit they deserve.
Again though, he's a very important figure in my own development and the development of so many kids. That's probably the difference felt though?