Kawakami: Brock Purdy’s perfect throw and the electric sense of instant 49ers history (paywall)
“But as Shanahan pointed out, Purdy wasn’t supposed to throw it to Aiyuk against that Seahawks coverage. Safety Quandre Diggs was sitting right there in the middle of the field and moving deeper. The window was going to be too tight. George Kittle was wide open on a shorter route. Purdy had to throw it hard to beat Devon Witherspoon on one side and also float it over Diggs. It was almost impossible. One degree off and it would’ve been picked off.