Interesting read on Brock. Not behind a paywall.
www.espn.com
Brock talks about his last 2 years at ISU which echos what many people suspected…he/the staff was overthinking things.

Why the 49ers believe in Brock Purdy, their star -- yes, star -- quarterback
Purdy doesn't keep receipts, but he does play with an edge that has allowed him to grow from "Mr. Irrelevant" to the QB of a Super Bowl favorite.
Brock talks about his last 2 years at ISU which echos what many people suspected…he/the staff was overthinking things.
The rest of Purdy's time in Ames didn't go how he had hoped despite continued success for the team. His freewheeling approach that led to an average yards per pass attempt of 10.2 and 8.4 his first two years declined to 7.5 and 7.8 as a junior and senior.
"I became sort of a head case in terms of not playing the convicted way that I had before," Purdy said. "I was more about what other people thought of me. I feel like I sort of just played not myself. I was just playing quarterback in the wrong state of mind."