Do you think Jett would have been the Choosen One if he hadn't died and if Anakin wasn't part of the prophecy and if Palpatine wasn't so evil? It did say in the Episode III Visual Dictionary that he was one of the best Younglings and was gifted. They gave him his own section.
To become a Jedi requires the deepest commitment and most serious mind. It is not a venture to be undertaken lightly. As such, Jedi instruction is rigidly structured and codified to enforce discipline and hinder transgression. Only 20 Jedi have ever voluntarily renounced their commissions. It is with great regret that the Jedi order recognizes the so-called "Lost Twenty." A Jedi who fails in his training can be a very serious threat. The dark side of the Force beckons to the impatient, and students in the past have been lured to its call with devastating consequences.
Any new younglings should learn the weakness of the sith. The Bear Clan basiclly had learned that already because that group is for gifted jedi children. But the new ones should learn all weakness before sword training and to become one with the force. That way the sith may be destroyed more easy. That is the jedi weakness; not knowing weaknesses. Most of the jedi younglings has died because of it. The Jedi Order doesn't need that.
Do you think jedi are more powerful than any form of organization? Just think about it. Qui-Gon died because of Darth Maul. Obi-Wan died because of Darth Vader. Ok, so he became one with the force but you have admit that he lost. In the new republic, many more jedi were killed by smugglers, pirates, and sith.