They must be mad dropping Saha who broke MS Dhoni's record of most dismissals in a test match (10 Catches) and Bhuvi who had very good test match both with the ball as well as bat. Ishant also deserves to play as someone needs to hold one end without leaking runs and Ishant is a master of that. But replacing Bhuvi might not be a good idea. Ashwin will have no scope with this bowling on this pitch so may be Ishant could come in place of Ash for this test. And for the future who ever among this 5 pace bowlers perfom consistently should get the nod when Ashwin or Jadeja comes in when the conditions are good for spinners.