Well the Sky commentators believe there is nothing in this pitch for the bowlers except bounce, so I doubt Ganguly got anything from the pitch in that dismissal. I think it was the change in pace plus the break of concentration during the drinks interval which got India the breakthrough.
But nevertheless, getting Cook was important for India because he is one who keeps getting the big scores for England. Also England will need to post a big score (450+) and relatively quickly (which they have done well till now) in order to stand a chance of winning this game. Looking at the pitch, plus the inexperience in the bowling, it'll be hard to get the Indian batsmen out twice.
But I for one am happy that Tremlett got the nod over Broad, and Anderson was a must in Hoggard's absence.