Ravens coach John Harbaugh, a former Eagles assistant, believes that Philadelphia backup quarterback Kevin Kolb has potential as a starter. Harbaugh had a front-row seat in Week 12 when Eagles coach Andy Reid benched Donovan McNabb at halftime in favor of Kolb. "I thought he did pretty well, actually," Harbaugh said of Kolb. "He moved them down the field on that one drive [in the fourth quarter], and then Ed Reed made just a ridiculous play. An Ed Reed-type play." He reiterated that Kolb has the stuff to be a true starter. "All I know is I saw Kevin Kolb every day in practice for a year when I was the secondary coach [in '07], where he was going against the defense as the scout-team quarterback," Harbaugh said. "When we did red zone, we couldn't defend him. I mean, he'd run the red-zone offense for the team we were going to play. We had the No. 1-ranked red-zone defense in the league 2 years ago. And we couldn't stop Kevin Kolb. Throwing to Mike Gasperson every day in practice. He picked us apart. "[Eagles coaches] love him. He has all the tools. He's a leader. He's tough. He plays the game the right way."