From the February article:
Purdy’s rise from being selected as “Mr. Irrelevant” has been one of the most remarkable stories of the NFL season. The Athletic reviewed a pre-draft scouting report from an NFL team to explore why the four-year college starting quarterback lasted so long in the draft, then spoke to the coach who wrote that report and asked, on the condition of anonymity for competitive reasons, what he sees in Purdy now, what other teams might have overlooked and why the 23-year-old has been such an ideal fit for the 49ers.
[...]
The strengths for Purdy were that he was “VERY” experienced with 48 college starts and that he manages the game well, making the routine plays consistently. He was creative as the play extends and “works through his progressions very well.”
The weaknesses: “sawed off … not a very good athlete … limited arm, both in strength and throw repertoire.”
[...]
Asked where he thinks Purdy would be drafted now based on what he’s shown this year, the coach said probably second or third round.
“We undervalued his agility and probably the mental side, and San Francisco is perfect for it because they put a lot of importance on that because of their offense,” he said. “In San Francisco, he can operate and play-action and boot and screen and manage the game. It’s not like he’s playing in a system like in Buffalo where the Bills are relying on Josh Allen sitting back and just chucking the ball all over the field, where it’s like, ‘Good Lord, how are you making those throws?’”