IMO, it will be much smarter for PLAAF to give a STC's unit the J-20. It will signal the West and Taiwan that China means business in the SCS.
BTW, are the 1st, 2nd and 3rd Bgd all under the same base?
@Deino
This base doesn't appear in your book, isn't it?
Also solve the problem - the name of the XJ Army Aviation Brigade is the 84th (According to this tweet).
There are two Xinjiang LH Brigades though, or at least two air bases. One near Changji (which is where these choppers are from) and another in Shule near Kashgar. I said I/U just because i don't know the unit number. XJMC's structure is pretty significant compared to the Theater Commands - Still...