I finally found the results of the Midwest Mustang Challenge listed here:
We haven't had the opportunity to talk to him but it looks like our favorite Trainer, Mark Burnette and Mustang Sally didn't make the top 10 winner's list but did finish up at number 13 in the total scores in this competition of 50 trainers.
I have also searched through some blogs of other trainers and found out that Mustang Sally sold at auction for $2700.
One trainer even said that Mark should be a comedian:
Jessie and Remington's Blog