If the J-20 is primarily an air superiority fighter, the J-35 also seems to be principally intended for air superiority, and the new J-36, a [choose pronoun] fighter (but basically air superiority), that's a whole lot of air superiority platforms.
The PLA will eventually need a new stealth aircraft to fill the role of naval strike. They can't just rely entirely on ballistic missiles, drones and the H-20 for all bombing needs. I think the SAC plane is a JH and is going to replace the JH-7 and flankers in their respective roles.