You are very astute in your observation my friend.
My minor at UT was in Psychology and you are 100% correct that past events shape our future, especially events from growing up. If a person was abused as a child for example, they may have problems having relationships as adults for fear of being abused again. Or the opposite can even happen, you seek out relationships that are abusive to reinforce your self image from childhood that you deserve it. If something very emotionally devastating happens, it can cause irrational thinking and impact your decision making every decades later.
If Jerry was rejected or shunned by his father then "the snub" where Jimmy Johnson and others rejected or shunned him could have retriggered those very powerful emotions and that is why he is so hell bent on proving to everybody that he is a "football guy", even if we have 25 years of failure that shows otherwise. To Jerry, stepping back and hiring a gym would validate those that shunned him or mocked him and would be very emotionally devastating for him to accept. You could see some of this in his erratic behavior this week, crying after games, talking about redemption, being extremely irritable and cussing like a sailor on the raido, ect….
You have to understand the mind of Jerry in order to understand his actions and decisions he makes, it does not all happen in a vacuum.