I think it is simply a matter of making sure their design will handle the stresses of cat launches and traps. They can do traps themselves soon on the Vikram, but it will be a long time before they can check the LCA-N against catapault launch stresses. They want to do that before they go into production. So, it would have to be the US, the French, or the Brazilians they test with since they are the only ones with operational catapaults on carriers.However, it'll be a full decade - if without delay, that is - before IN got their hands on their first CATOBAR carrier, INS Vishal. Thus, with all these US "help" India's national policies won't stray far from US' tunes, which will make India predictable.
Since the INS has an interest ultimately in EMALS for the INS Vishal, making the arrangments with the US now makes perfect sense. I would not go too much further in psyco analysing it than that.
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