http://www.nhl.com/ice/playerstats....osition=S&country=&status=&viewName=timeOnIce
Unless I read these stats wrong:
Kulemin:
2010-11: 13 pp points in 200 mins.
2011-12: 5 pp points in 60 mins of pp time
2012-13: 0 pp points in 20 mins of pp time
2013-14: 0 pp points in 5 mins of pp time.
Clarkson
2010-11: 2 pp points in 136 mins.
2011-12: 16 pp points in 244 mins of pp time
2012-13: 9 pp points in 170 mins of pp time
2013-14: 2 pp points in 64 mins of pp time
Kulemin has been seeing less time on the pp and has not been given the opportunity to redeem himself. I think he'd be better on the 2nd pp line because he is stronger at protecting the puck and perhaps preventing shorthanded goals. He also has a strong cerebral game. However, it makes sense to have clarkson there instead since you can park him in front of the net and Clarkson is supposedly a cycle player, which I have yet to see. Clarkson has horrible balance on his skates and as Kadri needs a complementary player with that attribute in order to complete that second line. Kulemin is built like a truck (not a power forward but still quite strong) so I think he can easily develop chemistry on the 2nd pp unit. I would like stats to see how effective Kulemin has been on a line with Kadri.
If you look at the underlined phrases, I would even argue that Kulemin has outproduced Clarkson. I am sure that had Kulemin had triple the minutes he would match or surpass Clarkson's output.
tl;dr: Kulemin has relatively similar production as Clarkson if he is given the time. Kulemin has experienced little time on the pp. I would argue Kulemin should earn time on pp due to his defensive contributions and that his style is complementary to Kadri's.
note: I have an obvious bias against Clarkson.