I’m sick of all this nonsense I dont think they are all trying in group races , some are pace makers some are second string some are just there to pick up place money some are there to put other horses off , or give the mega rich owners a fancy day out hence the 90% guess
its probably a lot less.
Many of the decent jump horses are flat bred and often failures on the flat then there is the cart horse brigade
I used to care about it as a sport , but not any more