Penguins prospect Scott Harrington noticed an immediate difference from last year’s camp. “There are definitely a lot more defensemen,” he said, “and good defensemen at that.” A second-round pick in 2011, Harrington has joined a dozen other young defensemen this week at Consol Energy Center for the Penguins prospect development camp. It’s his second time at the weeklong workouts that end today with a 3 p.m. scrimmage that’s free to the public. A year ago, there were nine blueliners. And of them, few were high draft picks. But this time there are four first-round picks and three seconds.