I was doing the group a COURTESY in finding a varied number of cases of this occurring in a single day before talking about it in more depth to SUNSTANTIATE how often this occurs.
By coincidence, the HIGHEST ROI I ever found happened Saturday in Woodbine's 7th when the two lowest odds horses in the race, ran 1/2 (predictable) and the ensuing group created this payoff.
https://www.equibase.com/static/char...091821CAN7.pdf
WAIT, I am in the process of finishing the collection of that data so that further explanation of the mechanics will make more sense...More examples to follow a several different tracks on several surfaces as I have been founding for the last several years. Be Patient.