Dravid is capable at no.4, probably suits the team best. You want to add balance to the batting line-up. He is going to retire in two-3 years, we want someone who can carry the responsibility, and Kaif is quite good. Has the technique and temperament.
Sehwag can either open or come down the order. Its not easy to find good openers, especially when you play away. We haven't played too many games away from home conditions. Sehwag and Sachin are probably the best we have now, can't change that. Sending Pathan at no.3 can be used a a strategy.
We'll need to find replacements for Agarkar. This guy can get wayward at times. It would be nice to have Balaji back, if he's up for it. We need someone who is tidy, and can pick up wickets in the middle overs. Kumble has done a great job, and we'll need more of that. Powar is also a temporary option, i feel sachin/sehwag/yuvraj can do better than him.