Like it or not, what
Yangwei and
Chinese Tiger1986 said were true.
It won't be hard for anyone to understand why.
Think about it: no big power shares its most secret weapon and the most powerful tech knowhow with others. US won't share with anyone, Israel or not, its F-22A let along ToT; China of course won't share its J-20... even France and the EU won't share their most powerful block of Rafale and ET respectively. What they will happilay share wee their TEAM B.
The question is therefore what makes you think that Russia will let India buy its Pak Fa T-50 with all the knowkow and top tech of Russian Air Force use? Perhaps Ruskies are drunk all the time but not dumb.
So why? The answer is very simple. And I don't need to see the detail of PakFa purchasing contract to know it:
What Ruskies did was to design several seperate airframes with the budget they got from India. What it will produce is a minimum borderline "5th gen"to minimumly satisfy that 4s inoder to deliver their words to India: you see, this is 5th gen.

Yet Ruskie will only put the second best tech in it, particularly the crucial tech. After India bought it, they would develop their own FAGA according to it. Then it's India's biz, Ruskies can say that thye have delivered the contract. Then later, Russia would put thier best tech into thier own either PaK FA block 2 or completely another airframe thus Indians will have no cliam on it whatsoever according to the old contract.
I will bet my bottom $$$ that Ruskie would doublecross the dumb elephant. Honestly, it is very logical and understandable.
Think about it,
ptldM3, what would you personally do in such a scenario?
Therefore, what Yanwei told was blunt truth! Simple !