If someone is escaping from Law doesnot mean that other accused should not be punished. Everyone has to be punished when they are caught& proved that they have done against LAW.
Any one who is handling/ having mass destructive object has to punished between 5-10 years as per law. thats gives sanjay minimum 5 years. Rest 1 year is given because of other crime he has done like having contact with underworld, etc... So 6 years is the least punishment given to anyone.