Until all the facts are known ( e.g. what was the readback of NCA and what was the reaction of the controller to that readback) we can only speculate wildly on this case
A few points however :
The title of this post is based on a sensationalist newspaper headline and is what I would describe as "fake news" . 2.2 NM same direction with the faster one in front is hardly a risk of collision . loss of separation yes, risk no. The EVA opposite was turned away after STCA alert , no loss of separation and no risk either.
That said
Delhi FIR is RVSM and seen the 3 types involved the 1000ft sep is absolutely normal . they were in controlled airspace under positive radar surveillance, as the STCA and vectors issued confirmed.
There also seems to be some RAs involved and it would be interesting to know who got one, who followed the RA and possibly who did not and if possibly the controller issued instructions contrary to the RAs. That could in fact be the core of the problem here . We'll see when we get the facts .
In the meantime wish you all a happy new year , and my advice for 2019 would be : always follow the RA even if the controller tells you otherwise .. Safe landings too
