I stumbled across this 2019 article while looking for something else. I don't think it will answer your question, but you may find it interesting in light of concerns most of us have with what's been happening lately.
Fifty Years of Play-Action Evolution Has Led to Sean McVay’s RamsThe notion of faking runs to help the passing game is as old as football itself. So how has McVay used that concept to make these Super Bowl–bound Rams unlike any offense that’s come before them?By Robert Mays Feb 1, 2019, 6:30am EST
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www.theringer.com]
Edited 1 time(s). Last edit at 11/02/2020 08:14AM by MamaRAMa.