Forgive me, but I am gonna take a crack at this…In this stream, Yankee was imply that 36011's caret intake was done for two reasons:
1. CAC has always wanted to give caret intake a try, if nothing else to get a hands on feel for aerodynamic and RCS characteristics of these intakes. Though unless caret intake turns out to be much better than CAC's estimation they've always perferred DSI.
2. They were judging that NGAD/F-47 prototype would fly sometime towards the middle of this year. Since caret intake was a much simpler arrangement than DSI 36011 could be ready for maiden flight much earlier than 36022, thus beating the Americans to the line.
Point 2 turned out to be too optimistic in terms of US 6th gen development, but their own estimation on when the two prototypes were correct. If indeed they only went for 36022 and the Americans worked as fast as their estimation then F-47 would have beaten J-36 for maiden flight.
Yankee said DSI is much more complicated than people realize and even for CAC, designing a completely new one for a new plane takes time. J-20's DSI is not just a fixed piece but actually has an adjustable component to it. However he has yet to observe anyone outside of China coming close to correctly guessing now the adjustability is done.
The DSI bump could be expanded and contracted by air pressure, like bubble gum.
 
				 
 
		 
 
		