I think the challenge for some types of thoroughbred jumpers is being able to generate the necessary bouncy energized slow-enough canter needed in the show ring from which to jump from. Some thoroughbreds seem to generate the quick spring energy for the jump/leap covering a massive amount of ground from speed.
A relative’s horses who jumped successfully in 1.6 m classes (and was a lot of blood) did not do so from a “dead” slow canter, but rather a canter that contained lots of energy which seemed to transfer to an cat like spring. He was always the fastest.
I am not sure all successful “jump” comes from the exact same bio-mechanics? Does the cat like -light-effortless spring come from the same mechanics as the “power” spring? The latter I think of Berlin and Cumano types-the former right now …Tequila? (I notice at times she looks like she is ready to go side-wise! All WBs of course but different.)