After analysis of the voting patterns of India in all episodes, following could be derived.
1.) Debojit is just winning on regional votes and without it he would not be in even top 10
2.) Vinit is most liked in almost all parts of India
3.) Girls are voted lesser than boys.
4.) Shortage of electricity/satellite link failure can ruin somebody's career(specially regional singers)
5.) Mentor's arrogance/likeability plays a major role in voting
Any more facts, please add....