Most people don't realize that,, koi have 10-20k offspring and usually means a handful of the fittest survive naturally.
But these koi are going through absolute intense selective processes,,, so these fish are selected to fit the Japanese made catorgories.
This means that some weaker individuals are bought through in the nurturing selective processes.
Thus is why some indivual koi may seem sooky or weakish.
And, Den, your words, I could be wrong,, sounds like you've spoken to Alan and you've already been primed coached by him.
If you havnt and your serious, call Alan, and lol, I think I may know you more than you know me,, don't ask how, got my ways.
But your similar to me, I mean thinking, not the fact we are Italian decent lol, but call him and he'll invite you to his house and you can see exactly what you just explained with the view panel,, his is massive, like 33+ thousand liters built into a massive alfresco outdoor living area,,,, he can point out every single koi to you with its entire history,,, before you know it, you have to go home because the sun is setting lol.
A few months later your wife will start hating you because of your obsession with $2k koi lol.
When breeding,, lead up to xmas is always very exciting,, the males really torpedo themselves nose first into females fat bellies towards the rear trying to pop the egg tube into distention so the laying/fertilization process can begin.
Ask Alan for the Hiroshima documentary video,, there's koi the size of small Dolphins on there.
If you think your hooked now,,, wait till you watch the video.....