Rick Joe wrote a bit about how the J-20S has served as a test-bed for the J-36 fighter. With that in mind, I really believe that the J-36 is a two seat fighter.
Other things China used the J-20s to help design the J-36
-acting as a drone command ship
-serve as suite for EW
-power generation of WS-15 for a command ship and this lead to the decision to have 3 engines
Other things China used the J-20s to help design the J-36
-acting as a drone command ship
-serve as suite for EW
-power generation of WS-15 for a command ship and this lead to the decision to have 3 engines