first - i do not understand why do you think the process of teaching newbies in clan will be so super-effective in comparizon with what they do now....just challenge a general and learn..what else needed?
Well, here is a little thought of mine on this topic:
When a new player just challenges an unknown General and plays him, in most cases in about 5-15 turns there will be a situation where the outcome is obvious and both General and the newbie will have lots of reasons to stop the game (due to losing interest, boredom, etc.) and this "freeze" will be initiated by the newbie most probably. Even worse, he may be totally dissapointed by such a powerful opponent and quick defeat and may even dropp off the game before discovering the full beauty of the online MA warfare.
However, when both of them are tied by additional level of "involvment" - that is Clam membership and the corresponding obligations - the newbie would be more likely to continue the game, because he would have a sort of obligations in front of his clan-mates. He would have greated desire to keep fighting - well, in not for winning this particular battle, but for moving to the later stages of the battle to gain more experience, etc. And noone would accuse him of betraying his comrades!
Similar considerations would be applicable to such a General, especially if he's playing a newbie from his clan. The General won't be mocking but rather giving good advice here and there, and the newbie will more likely to feel like being tought than torn apart by his clan-mate.