looks like it just goes up by 3 and then 4 and then 2 in certain intervals. but I haven't taken a good look at it yet. there is also a pattern in the suits.
well, I know one of the tutorials is from kevin ho, a respected flourisher. Lots of people offer tutorials for flourishes. there is no "secret" to a flourish. Remember Jason Soll and his tutorials? I don't think anyone complained.