It makes sense to me. Ojha is an off spinner, Piyush is a leggie. All our parttime spinnes are offie. and Bhaji and Aswhin also offie. If you wanted Ojha in the team, then it could be at the expense of Bhajji or Ashwin. Three specialists offie are a bix luxury when you have Yuvi, Sehwag, Yusuf and Raina to do some help.
Omission of Sree and Rohit is bit surprising and I don't think the team got right balance. We have only one spare batsman.