consider this... all the Jounins can fit in an office with the Hokage... not many... they are the elite of the elite... Kakashi level ninja like Kabuto can easily take out an ANBU who is only of Genin or low Jounin level. Look at the way Kakashi and Gai tore through the enemy like they were paper toys... so when they say that the Konoha is weak they were underestimating it's power. After all the Leaf did defeat 2 countries at once.