I enjoyed this read. Very well thought out.
I'd like to propose something which addresses your Jimmy comments.
How much of an advantage did Jimmy and his cadre of coaches have, even over the NFL because they were scouting players to bring to Miami, or scouting players when they were facing them on the field?
It has been my contention Jimmy and company had the information on every player headed to the NFL, and a giant list of people to call if they had questions which needed answering. If for no other reason than up to that minute Jimmy hit the NFL, not many college coaches made the leap to the pros successfully. There are anecdotal instances, but the harvesting of college coaches for the pros had not found purchase yet. So Jimmy making a call about possible draft prospects would perhaps get information beyond height, weight, and forty time.
And if that were the case, then does that also explain why all the assistants who went elsewhere were not overwhelming successes. Because of the information ceased to be forthcoming on the athletes since Jimmy and company didn't have first hand information any longer?
This might be insight into why Jimmy didn't make it in Miami, and the possibility that if Jimmy had stayed, his drafts would produce less and less star power. Especially since he no longer had near three times the picks of the rest of the teams in the draft over his tenure here.
I have wondered about many of those questions myself.
When Jimmy first came into the NFL I think he probably could have filled the coaching staff three times over. He had been an assistant coach at Wichita State under Johnny Majors. He was also an assistant at Oklahoma under Chuck Fairbanks. He was the DC at Arkansas under Frank Broyles and assistant head coach for Pittsburgh under Jackie Sherril. He then went on to his first HC job at Oklahoma State. His network of conncections had to be massive.
In his first NFL draft he came to the party a little late to do extensive research so he relied on his personal experiences late in the draft when he took former Miami players Rod Carter and Randy Shannon in the 9th and 10th rounds.
I can confirm your theory with the following information:
During his 5 years of drafting Cowboy players Jimmy drafted 7 players from Miami, 4 from Florida, and one from Florida A&M. I think this shows that he did rely on a lot of personal connections. However, five years removed from college coaching represents a huge turnover in the coaching ranks so I'm sure he wasn't as informed when he took over the Dolphins.
However, I think there were also other factors like being forced to keep Marino longer than he wanted as well as some real bad luck with injuries. He had wanted to base his offense on team speed but injuries to 1st round picks Yatil Green and John Avery severely impacted the talent level. Additionally, his errors were more magnified with the fewer choices. There was no Herschel deal to provide a margin of error.
Success is fleeting in the NFL and a repeat championship with a different team has yet to be accomplished. No HC has actually won a SB with two different teams although a few have come close. Success is a complex recipe with many different ingredients and coaching is just one of those elements.