Davenport had left his long-term organization (San Francisco) because the Giants wouldn't promote him from managing Phoenix (1971-1973) when they fired Charlie Fox. (Instead they hired Wes Westrum. Yes, really.)
So Davenport spent 1974-1975 coaching for John McNamara in San Diego. Then in 1976, Bill Rigney returned for one season at the helm, and Davenport went back to the bay. (He coached under five different managers before getting his own [disastrous] turn at the helm in 1985.)