Nice to see this "toads" story bubble up to the top again.
"It was the result the methodical and steady guidance of one incrediable man - Coach Larsen."
I'm not discounting Larsen. He was and is a legend in San Diego distance running. However, his influence on this group, while significant, was not the whole story.
It all starts, IMO, with Tim Danielson. Much like Webb and Ritz rebooting HS running in the US. Danielson did in SD. Competition and idols drives young runners to strive for more. Danielson drove other runners in SD to achieve more.
Runners like Armando Valencia and Thorn Bigley came after Danielson. Bigley went to Clairemont. Dave Harper ran for Clairemont right after Bigley and won CIF (the San Diego sectional race) mile in 69, 70, and 71 (4:16, 4:12, 4:12), and CIF XC on 69 and 70. He was the stud that Cotton, Mendoza looked up to. Dale Fleet was also on Clairemont. He was not anywhere in Harpers league until senior year track and he still could not touch him in the mile, but he peaked at the right time to win the state 2-mile and a record time.
At the time that torch was passing from Danielson to Bigley to Harper, Larsen was as HS coach. He moved to Grossmont right before Cotton, Mendoza, and Lux went there. He created powerhouses at Grossmont and '76 was right in the middle of this, but all those runners were something special before they came to Grossmont because they pushed hard to HS to live up to the idols before them and trying to keep up the the runners on other teams (or in the case of Fleet on the same team).
Now I don't know for sure, but I don't even think Larsen started the Toads. I think Harper and Fleet did because they needed a team to run on after finished college. Then they recruited and lot of their hold SD HS rivals to join them. It was probably those guys who got Larsen to "coach" them. The Toads were just a lose collection of SD runners running as a "team" at local SD road races. Most of the team were former or current Grossmont runners or past Clairemont runners, or guys who knew those guys and were worthy of a jersey.
Larsen, no doubt, had a huge influence on everyone he's every coached, but the Toads winning the 76 AAU was a case of right place, right time, and right circumstances.