Then I don't see why people are only just working through the apprentice now - if you're going to allow entry of a certain character, then lack experience against them - you are going to get annhilated. If one was inexperienced against Mitsurugi then got destroyed on wakeup, its their own fault, you could argue his oki is just retarded - he's not broken though.
Lack of knowledge is the biggest handicap you can take into tournament play.
If I was to focus train against the apprentice with Sieg - I'd use a lot more of iag:A, 3A and stances at range - forcing him to waste meter ripping me out of them with A+B and to shut down his movement. You just have to have enough give in your strategy to adapt to any character strategy. That's the differance between a good and a great player...
Not that I'm a great player, I have no doubt RTD would 10-0 me, but I'd spend my time learning from him about my own flaws. :/