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Bryan wrote: Peterson's mentoring of Parcells lasted all of 1 season (1970) before Peterson jumped to Rice.
In addition, Gibbs got his coaching start under Don Coryell at San Diego State, who he had played under, BEFORE heading to Florida State. Coryell then brought him into the NFL when he took over the Cardinals in 1973 and then hired him again in 1979--since Coryell took over the Chargers four games into the 1978 season. After two seasons, he was hired by the Redskins and did fairly well...
Anyways, the upshot of it all was that Rice was pretty terrible (3-7-1), and Peterson spent most of the year hanging out with Bud Adams and negotiating his 'lifetime contract' with the Houston Oilers.
What's scary is that Denver was also trying to get Peterson, as mentioned in this article: