True but every district equation is diff.Don't assume that Sena will get highest seats if they fought on maximum seats. They have been winning Mumbai Municipal polls since ages but still not able to maintain the city.
Also, No Bihari or South Indian will vote them. There are other parties also.
Margin of both National Parties and Regional Parties are small in some States unless like WB, Kerala, TM and North East states having dominance of Regional Parties.True but every district equation is diff.