I don't believe it's un-related at all.
It used to be a cardinal sin to have a horse behind the vertical for a part of the test, let alone the whole thing.
Yet how ridiculously high are Totilas's scores, which a head behind the vertical an entire test? Anky's horses? Countless others? Broken at the third vertebrae, and their poll is never the highest point--because they are pulled into position.
I tend to think they are very related.
There are a lot of scandals that go on about judges accepting bribes, it is just very well swept under the rug.
Why do you think Mariette Withages resigned from the FEI dressage committee, three months after she judged at the olympics and Isabelle won the silver medal and team gold after her horse was severely disobedient in the test?? Hmmm I wonder.