I can see how you think riu control a third party in terms of gelding??? A tough outcome sure but not sure you can blame a governing body for a third party action. Good luck
That's why monsun was slow to come out here. I remember asking darley uk why they had not bought manduro out and their reply was German sires not understood in Southern Hemisphere.
Someone has to be the lead (and show success) then you get the fast followers....
eg high chap stallions
eg street cry
eg soon deep impact
eg who's next as a major sire of sires - Sebring? Snitzel?
Others will have better feedback - that 20:20 indication focuses mainly on sire crosses and similar duplications to your proposed mating. Use it as a info guide.
It obviously doesn't give you any detailed family info or influence.
Very strong mare - won 6 by Karioi Lad, is buried in my back paddock - should have been nominated for NZ broodmare of the year for her owners.
Outstanding types left by her. Best mare power I've seen in 20 years.