Just something to bring up, we really could use some more refinement this offseason on what constitutes an RP and who absolutely needs to be a P or SP. When I was looking for replacements for Williams, just about all of the top performing non-closer RP's have at least 1-4 opener starts this season. It's a pain in the butt to ask for permission to roster someone like Bradgely Rodriguez as an RP with his 4 opener starts, but as things stand right now without permission, he's unrosterable in this league even though he's having a great season.
I'll put this in the offseason proposals, but maybe one way to do it is if a pitcher has 5 or fewer opener starts of less than 2 IP's, it should be OK to list him as an RP. The moment they have a start over 2 IP's or exceed 5 starts, they're an SP.