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.
So far he got opportunities to bat in 5 innings, and made a total of 117 runs, with a top score of 40. Perhaps time has come to give opportunities to some of the other batsmen. Sai Sudarshan was given just one opportunity and after that he was dropped. Perhaps time has come to bring him back. Nair can focus on county cricket and Ranji Trophy for the remainder of his career, and he doesn't looks like a suitable fit for the national team. BTW, Abhimanyu Easwaran also need to be given at least one chance in this series.