Do you remember many years ago I said that the IN plays their procurement game very well? They supported LCA-N knowing, very, very common knowledge, that the LCA-N is doomed to fail even before it started. And that the navy will then use that as an excuse to push for a more advanced imported jet? Do you remember?
All this talk of MRCBF for IAC-1 is just eyewash for the real requirement, which the other two forces are doing their best to stop, the third large carrier. Once the MRCBF gets the go-ahead for IAC-1, the IN will say they have enough jets now for IAC-2 also.
Dude, I pointed these things out years ago. Don't tell me you don't remember it.
They will at best earmark 6-8 MRCBF jets for Vikramaditya and IAC-1, which was also their initial plan with LCA-N, and leave the rest for the IAC-2, and such a small number of jets won't really require the use of the lift either, especially so if Rafale-M is chosen. That way they can show that the jets are meant to be a complement to the Mig-29K and also get jets for IAC-2, while also increasing the basic capabilities of the first two carriers.
As for the carrier, yes, you either design the jet for an existing carrier, which is impossible for the MRCBF, or you choose a jet and then design the carrier. Anything else is unrealistically expensive. The Chinese chose the second method for their new carriers. And naturally, we have to do the same. For TEDBF, it's going to be the first method.