Have not used this myself and have not seen the need to try and figure out how to do it with my breeding being well established. But I have no problem with it being released, it's a free world, and as you say many people already use their own versions of it, though I think this is maybe the minority.

I am curious what happens when it is combined with legends, do they then come up for auction and does this then open Pandora's box for those happy to try and use these horses for breeding in the league? We saw it last year with trainers being banned and adds a layer to the work for those running the league. This aspect should be considered.

Can you actually breed with the Legends?

I also thought it was something impossible, I never thought about the implications of being able to buy them from my schedule... I actually thought they would have already just been sterile. Because you could have them not follow their career paths, and idk maybe they'd end up at an auction through a claiming race for some odd random reason, I figured without altering the schedule like I was that Mark would have considered the fact that there was a chance (however small) they might end up in someone's stable through normal gameplay, and would have just made them sterile for that reason.

If I knew I could buy them I may have created a throwaway save just to buy Secretariat and see his stats (I'm curious). He's my hero worship horse and I'm curious if Mark did him justice, but I'd never breed to him and try to enter the resultant fraudulent pieces of data into league! To me cheating like that, ruining everyone else's hard work and fun for absolutely no reason just so you can reap the praise and pride is just sick. What kind of person can actually enjoy winning something like league (where no real money is involved, just praise, fun, and a sense of pride in their hard work) when they know they cheated and don't deserve any of it? To me that just takes a real sociopath or narcissist.

Yes -you can check out their stats in game - Frankel's stats are off tap and is really the only legend that could dramatically alter your horses from donkey to freak. The other legends will speed up your breeding 10 fold but in saying that I'd say the PJ's horses would easily beat the in-game legends.