You're clearly claiming you know the Russians' design criteria, design trades, and design calculations.
Errrm, not exactly. But I did read the
ing patent, where it said that a flaw of the F-22 design was that the LOS-blocking ducts took up too much room.
And to repeat my point - your cardinal error appears to be to assume that the T-50 has a much higher RCS than the F-22/35 based on the use of a blocker. To quote:
Those differences in RCS reduction methods result in multiple orders of magnitude differences in RCS.
There is no data at all to support this sweeping (note emphasis) claim. Fully LOS-blocked, curved-plus-blocker and even gridded inlets will all reduce RCS very nicely. It's all a question of how many bounces you get between the energy going in, hitting the compressor and bouncing out again.