India lost because in second innings they relied only on KL Rahul and Pant batting, if remaining batsmen have scored some runs then target would be high for England. The English team got good start in second innings and rest of batting take over responsibility once the opening pair got out. ~
Indian team selector wasn't relaying on those two batsmen only. Everyone expecting good batting performances from the whole squad. But their lower order had collapsed in both innings unexpectedly. This is the primary reason for their loss. And the opening pair of England was phenomenal in the second innings. They deserve 90% credit for the victory of England easily like that. The result could have been different if they had lost two to three wickets quickly.