The distribution of the team can be chosen by the national selectors, or the captain of the national side. This way we will end up with much balanced teams, and the 2 players from the national side can act as captain and vice-captain for each side. Then select a couple of true pitches like Mohali and Calcutta, and let them fight it out. The advantages seem endless when compared to the existing ranji format. For one, the players in the national side will get a chance to play with the aspirants, and get a chance to see their performance, and judge them personally, both as team-mates and as rivals.
Selectors get a chance to judge players on a common platform, against players of the same calibre.
With all the talent of the country concentrated in one tournament, they have a better chance of making a good selection. Often the players have being complaining about regionalism in the dressing room, and even on the field. When you play with the same players again and again, you are bound to favor him over others. This format will improve player interaction, and prevent groupism. With five players from the national side acting as captains, and five deputies, you get a chance to see their leadership qualities at the same time, and better still, pitted against each other.