What this tells us is that no one really knows how the J-20 is optimized.
And I believe that that is, should be, and will be the case! Let's try not to be inflicted with the Web-surfing Intellectual Indians Syndrome: The tendency to appoint themselves to be the advisors to the world's governments.
For we all are aware that not many governments give too big a piece of shit to such forum experts/fighers anyway.