During the preseason, Orr had a team-high three tackles on special teams and four tackles on defense.
"He played well," Harbaugh said. "He's a really smart football player. For being a young guy, he's a guy who picks up football very quickly. There are a lot of players who can physically do it in this league. But football is a complicated sport. Not to disparage any other sports, but there are a lot of processing that goes on football between the time the ball is snapped and the end of the play comes up.