I think both of them are needed, and Sreesanth. Pace attack with those two out was heavily reliant on Yusuf Abdulla and Irfan Pathan, and while they took wickets they were both expensive.
Chawla's chipped in and reached double figures for wickets, but if one or two of that trio don't have much success, then the attack suffers. While that trio have reached double figures, the next best bowler is Yuvraj with three wickets. Says it all really.