I hope this isn't old enough to be considered necroposting. I feel that this is needed.
There really isn't much to aPat's strategy. If you master his execution, which would take a lifetime, then his moves and combos are pretty straightforward. Fight and learn against Edge Master on Legendary souls for tactics.
As far as winning with him goes...Once you get his moves down, use his range and speed to your advantage to overwhelm any opponent. Sakura Twister is good for whiff punishing only, and mastering his just frames will win you the match.
I personally feel that aPat is too ridiculous to use when there are more simple characters who can be almost as effective without having to press 316 extra buttons pressed per round. He is worth it if you're willing to master him, and I understand that his complexity allows him to be more powerful, but I also find that his complexity is unnecessary. They could have made him easier.
Out of the hundreds of thousands of good Soul Calibur players who have attempted to master aPat, only a few hundred managed to pull it off. So ask yourself, is he really worth it?
Jared The Killer (JTK)
Edited for typos.