I guess the best way to handle the team combo is to have Robin and Saurav as openers, Rahul,Sachin and Sehwag/Yuvraj as middle order and Dhoni, Kartik after that. Three seamers and one spinner is fine. Sehwag and Yuvraj can be alternated in the league games and among the two the better performer can be given more chances in the super 8. I am sure Sehwag will be kicked out that way. Among the bowlers, Sreesanth and Pathan should get some opportunities in the league games to get into rhythm. This is the only solution I can think of.