I had a pretty unique opportunity (work-related) that took me to the Peterborough area, so I had the pleasure of attending the Knights (Harrington and Maatta) versus the Petes (Seymour) last night. Each of these three guys had pretty strong game and honestly, Clark Seymour seemed like he's worth mentioning in the same breath as Harrington and Maatta in terms of upside. In my opinion, Seymour might be viewed as a bit of a steal one day.
Harrington and Maatta are very systematic (how could they not be playing for London) and are clearly well on their way to be a big part of the Penguins blueline of the future. Maatta seems to be more of a distributor from the backend, while Harrington seems to like using his shot a bit more. Neither are overly physical, but both seem to be engaged in the defensive side of the game. Harrington probably is a bit more polished than Maatta at this point, in terms of defensive play. Maatta had a couple of 2nd assists and Scott Harrington scored the game-winner on the power play.
Clary Seymour played with Slater Koekkoek for most of the night, and was very noticeable. Seymour is definitely a step slower than Harrington or Maatta, but doesn't seem to be "stiff" on his skates or have issues with changing direction (if that makes sense). Seymour is also quite a bit more physical than Harrington or Maatta. His puck skills are pretty decent, but his offensive numbers appear to be a bit inflated by playing with a quality partner like Koekkoek. In any case, Seymour finished with a goal and two helpers.
Just for a pseudo-comparison, Harrington seems like a more two-way version of Rob Scuderi and Clark Seymour seems like a more fluid version of Brooks Orpik at the OHL level anyway. Olli Maatta seems like he's tough to pinpoint from a comparable standpoint.