When the Broncos faced San Francisco in a joint practice last month, there were a trio of Super Bowl-winning coaches who watched.

There, of course, was Denver coach Sean Payton, who won a ring with New Orleans in the 2009 season. Standing between the two fields on that Aug. 7 morning in Santa Clara, Calif., was Mike Shanahan, who won Super Bowls with the Broncos in the 1997 and 1998 seasons and is the son of 49ers coach Kyle Shananan. And watching the practice on video later on was Gary Kubiak, who won a Super Bowl with Denver in the 2015 season and is the son of 49ers offensive coordinator Klay Kubiak.

Shanahan and Kubiak both spent plenty of time looking at second-year Broncos quarterback Bo Nix.

“I just wanted to see what type of athlete he was by the way he played,’’ said Shanahan,

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