The rational behind dropping the highest and lowest scoring judge is to eliminate positive and/or negative favortisim.
If all 5 scores are allowed a judge could give a 10 and spike the total, or a judge could give a 1 to drop someone's total score.
In that case no one judge can influence the result signifantly.
There is no set of rules which can enforce fairness, the primarly rule of the competitor must always remain, if I have five fools judging me and they give me first place, what does that mean?
Victor Smith
Bushi No Te Isshinryu
www.funkydragon.com/bushi