I’ve seen a documentary on Canadian TV about this. Impressive riding!
Does everyone know that chuckwagon horses are also OTTB? That surprised me, I was also expecting quarter horses!
But on the cost versus speed ratio, OTTB are certainly the way to go. You can get them for free, or much cheaper than any other functional horse, and even a race track washout is faster than most other horses especially at distance. My Paint can get ahead of a TB in the launch phase but the TB will keeping lapping around the turnout for half an hour after Painty is gasping and heaving by the gate 