Your numbers,, really khayali pulav at best
So IAF plans to induct 200 Rafales, , and 200 Gripens etc
Where do they bring in the money for that?
And these planes are what? 4th Gen, and 5th gen wannabes?
What would be their life in IAF? 40 years or so?
So since you talk of these 800 jets, till 2060 when exactly are we going to use 5th gen or later?
The 5th Gen era is now, the Chinese have a 5th plane, people say its not that capable, people said a lot of crap about F-22 also and now they admit that its one of the best planes flying.
Chinese may not have a perfect 5th gen planes yet, but if you see a bit differently,
J-20 as per me is not a fighter, but its long range Strike plane, very much to the stype of Su-34, So it comes in what some people call "heavy category" it will try to be VLO, carry its heavy missiles internally and hit strategic targets. Say Delhi or Kolkata.
J-31 is the version that will be like F22/F35 capability plane.
China is not as open as rest of the world, so if going by some analysis of some experts it good, but its best not to be caught napping
13-14 squadrons of MKI = 272, officially 13.5 squadrons
12 squadrons of Rafale = 200 + 36
10 squadrons of Gripen, now MCA = 200 (not AMCA)
6 squadrons of LCA = 123
About 800-850 jets.
This is what the IAF has planned as of now for 4th gen stuff.
This is separate from the requirements of FGFA and AMCA, and their deliveries will overlap since the production of the 400+ Rafale and MCA will take a very long time at 28 jets a year in total for both. Meaning, production of Rafale and MCA could go into the 2040s, parallel with induction of FGFA and AMCA.
Which basically means the IAF needs a 3rd jet in production alongside Rafale and MCA to get to 42 squadrons before 2032. And that was supposed to be the FGFA.