Pathan and Sehwag should both play in Indian team throughout the world cup...both are good allrounders and allrounders give depth to India's batting line up thats why I always say try to include allrounders instead of only batter or bowler..
One more thing I would like to add here that Sehwag dont have the versatility of shots which Sachin have so there is no use of Sehwag at no. 5 or 6...we already saw that in recent series that Sehwag was not comfertable there at no. 5..
India should use Dhoni at No. 3 position as a surprise tactic not only in this match but in some matches of super 8 also or they may send Irfan at no. 3 provided if they include him in final 11, which Dravid should do..
Mantra to win todays match and world cup..
Use Pathan, sehwag and Dhoni as a surprise weapons...India will definitely reach the semis and after that ANY TEAM CAN WIN THE CUP..!