I would think this invalidates the theory that 2084x tankers got re-numbered?
It seems like the longer term goal here is to have 20541 to 20949. We might be getting there next year. Producing 15-20 Y-20 tanker variants per year shouldn't be that difficult.
		
		
	 
Why would this invalidate the "theory that 2084x tankers got re-numbered"?
My problem is, that if they are not renumbered then we would have almost 40 tanker - IMO a bit too many even more so in one regiment (the 38th AR) - now and why then adding them in such a non-pattern system with some numbers left out and the starting again with 2054x numbers? By the way, with production being changed to the Y-20B/YY-20B, are there already enough old ones built to fill all missing numbers? 
If you take all individual numbers known so far, then there are almost 20 available, some with 2054x/2064x and some with 2084x/2094x numbers but overall a number quite realistic to a standard regiment and according to the production numbers "estimated".
If they are indeed all individual numbers - and assuming in the end there will be all missing ones filled in - then we would have a monster-regiment with numbered from 20541 to at least 20947 (as the highest number known) = 47+ tanker!        
In the end with the additional almost 60 regular transports, I think these are a few too many? Or am I wrong?