they could simulate blended red LO components among a more classical opposing force. That would make the case for the PLAAF for example and their J20s. Having IRST on each airframe should allow them to get cohesion in a dynamic 20/30km cube of space and the mix of red 117 and IRST fitted F-16 would be a good simulation for this.

Otherwise, their 117 are unmanned and the 16 are used as chase (I don’t understand otherwise why you would need a chase aircraft with two pilots).