Advantage India at the moment. They should be a bit more careful now that Archer is part of the lineup and shouldn't rely on Gill and Pant yet again if they wish to maintain that advantage.
We have not seen good batting from this top order batsman of India in the last two matches. If he fails to perform well in the third Test match, then the Indian management will probably not give Karun Nair any more opportunities.
Nair hasn't really used his opportunities well so far, but Rahul is totally fine since he scored a century and half century separately. Their middle order is in sublime form while their tail is practically useless.