LO, re the F-22 maintenance, I read it's being reskinned in the proposed updates.
Reference?
KenV - Your basic error is to assume (remember how we spell that word?) that features like blockers-versus-serpentine-ducts are indicative of RCS reduction across the entire design.
The Super H has a blocker because the Hornet configuration was never designed for LOS blockage and to change it in the Super was impracticable.
The T-50 has a blocker because the designers calculated that any aero losses would be less significant than the extra length and volume required for full LOS blockage in a serpentine duct alone. (It is, IMHO, a far more elegant configuration than the F-22.)