Believe me - I'll never be the one to say "this is the only application for this posture" however since this one was in the magazine and just so closely matched the posture in our kata I had to give it a try.
You are both smart and wise, and obviously partially due to an open mind.
And FWIW, I'm very cautious these days about sticking together too many of the postures in a kata in a row. What happens next in kata is sometimes meaninful and sometimes not (IMHO). So I look at each posture as a collection of stand alone principles to be studied and then stuck back together however you happen to need them in the moment.
That's a great approach, Dana.
In my opinion though the trick is seeing that there CAN be logic from technique sequence to technique sequence. However the logic displayed is an example of the application of grammar (sequence) to the vocabulary (techniques) of the system. The grammar shown is there to teach you the rules that you can run with on your own.
There are several reasons why I say this. As I learn more and more both about the kinesiology of the forms and the logic of how techniques create opening that begat more techniques, I feel like I have less and less to remember to make the forms work. Most of the Uechi forms are beautifully put together, and have gems hidden in them.
Seichin to me is the first and foremost example of a form that is just a jumble of "stuff." Many techniques alone have myriad applications, and I find I can make more sense of the application by stringing the techniques together in ways other than the way Itokazu originally put that form together.
However... Seisan most definitely has logical strings of sequences. And I see them repeating themselves in other systems, making me think more and more that the author was trying to tell us something really important.