Speaking on a conference call Wednesday, McAdoo noted that he was an assistant with the Green Bay Packers when starting quarterback Aaron Rodgers suffered injuries in 2010 and 2013 and that the team had to scramble to get backups up to speed quickly.
"Obviously Kyle is an offensive mastermind and knows what he wants to do and get done," McAdoo said.
The Giants might make a good test for Garoppolo. Their pass defense ranks 29th and their 13 sacks is tied for 28th. Only the Tampa Bay Buccaneers, with eight, have fewer.
Shanahan admitted that he was excited about his new acquisition and eager to see him in action. But he said he had to temper those emotions with the reality that Garoppolo still doesn't know a lot of the offense.
Shanahan noted that Garoppolo could have played against the Arizona Cardinals on Sunday. But it would have been an entirely different set of calls than the original game plan and would have been curtailed further after fullback Kyle Juszczyk, slot receiver Trent Taylor and tight end Cole Hikutini left the game with injuries.
"I mean, you're changing an entire game plan on the sideline from the first quarter on," he said. "That would be very tough for a guy who's been at three practices."
Beathard, meanwhile, absorbed 16 hits by a Cardinals defense that blitzed liberally and dared the rookie to beat them.
He acknowledged feeling more sore than normal on Monday and Tuesday, but said he was better on Wednesday and ready for another start on Sunday. He also said that some of the hits he took against the Cardinals were his responsibility.
Said Beathard: "I'll definitely try to do that better, get the ball out, not take some of those unnecessary hits that I don't need to take."
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