India should definately go into the Kolkatta test with 3 spinners.
If the curator's words are to be believed, its not going to be a rank turner first of all. And if thats true, 3 spinners would be too much of a luxury. Sehwag is a good enough spinner for the third spinner role along with Harbhajan and Mishra (no way Harbhajan will be dropped). We wont play 5 bowlers so having three spinners is just impossible (we have to open with a spinner then, which would be horrible as we dont have a Ganguly anymore)