.
Also the UADFs and GJ-X are certainly almost up there with the 6th gens too, the UADFs are for all intents and purposes light 6th gen unmanned fighters and GJ-X is a B-21 sized unmanned bomber, no one else has anything remotely similar in capability.
I think it's better just to define them by engines
So the UADF designs are single-engine 6th gen fighters, which happen to be unmanned