Z's career is now history. Who cares what effect the new track might have had on her career? It is never going to happen. We will never, ever know. That is because time only moves FORWARD. Not backwards. You can speculate on how any number of factors may have affected a horse's record, from the track, to the routine, to trip they got, and on and on and on. If ya'll have that kind of time to kill, go ahead.
Maybe the closers there can change up their strategy, stay closer to the pace if they can. IF. I can't help but think the track might take corrective action of some form with the track, if they lose enough horses to other tracks, and the other issues as well cause enough dust up (pun intended).