Why India loses test matches ?

PS : click on the image to zoom.

The graph shows the test averages of indian batting line-up. For each batsman, I consider three averages:
1) overall batting avg
2) Avg in matches India won
3) Avg in matches India lost

As one can see, other than Sehwag (and Yuvraj but he can be ignored as he has played too few matches and his avg is not that great),
all indian batsman fail to perform to their potential in the matches India loses...or saying otherwise, it is this under-potential performance of these biggies which is (at least partially) responsible for losses.