I thought he already had ventress so much for the rule of two. And if he had an apprentice why is he not mentioned in episode III. It is as stupid as making Anakin a Jedi master with an apprentice in Ahsoka who is also not in episode III.
If the Clone Wars series is not merely EU and is G-canon why does Lucas insist on keep destroying his own canon.
So much for a grand vision he is clearly making it up as he goes.
But Savage Oppress was a part of his original vision, right because its not fanwankery because fanboys whined about the death of Darth Maul.