HH88, thanks for sharing this with us.
When computers gave us the ability to make a 7-generation pedigree in seconds, we lost something - the consideration necessary to tabulate a pedigree 'by hand'.
And in the time it took to laboriously write it out, we probably enjoyed the pause it gave us for thought about each of these ancestors.
My old mate Clive Harper would have smiled wryly if he'd been able to read this post.
Those of us who were able to decipher the works of Harold Hampton, likewise. Clive was able to interpret Harold, and being a teacher by profession was able to render an almost-incomprehensible subject in a way that a few of us could comprehend.
Yes, there are many 'breeding enthusiasts' who think that it's possible to explain linebreeding in terms of stallions only. Sadly it's a bit harder than that.
'Put the best to the best, and hope for the best' is still practiced widely, but the clever linebreeder will always minimise the chances of breeding a 'duffer'.
Your analysis of Sir Tristram and his son Zabeel was pretty good, and while there will always be disbelievers who are either too lazy or ill-equipped mentally to investigate a pedigree beyond 4 generations, it's now well-accepted that much of the prepotency of a thoroughbred is 'off the page' or back 7, 8 or 9 generations or beyond.
Thanks for a stimulating analysis.
My namesake's breeder Federico Tesio would have understood your analysis.