I'm shocked that I just noticed now, and I hope that no one using The Armored Rose as an instruction manual notices either.
Thoughout all the pictures of all the stances, neither of the models ever bends their knees enough. Nor can I find any mention of bent knees in the text. Bending your knees is really important. In fact, I think it's the second most important thing for not getting hit. The first? You guessed it: keeping your sword foot back.
But really, even people who say that you shouldn't keep your sword foot back still emphasize the need to bend the knees.