Don't compare the kyuubi to the sharingan. Your whole theory about the Kyuubi tales individual abilities, while imaginative, has no merit. The Sharingan dot mean nothing but the level of development, not what techs are associated with them. Kakashi has three, but we don't see him Mangekyouing things (mainly because of the non-Uchiha blood). The whole point of them (the genin) having different abilites is to show INDIVIDUALITY among them (and also their relationships with their families/masters). With your "tail theory", we would have to accept that there are more tech types other then Nin, Tai, and Genjutsu. I say this because once you MASTER something, you generally don't improve. Saying that He's a Taijutsu master implies that he has reached the pinncle of Taijutsu, thus he cannot improve.

Well, anybody else want to add?