They don't move , that's the problem
The problem is they don't have a quaterback. None of our defense men should be playing on a first PP wave in the NHL atm. PP starts from the back. If the start is wrong then the rest will be wrong too. You also need a shot from the back and/or a guy able to sneak in. Our PP under Markov was always one of the best and it was mainly because of Markov not because of the coaches or the forwards.
PP under prime Markov :
2002-03 : 14% (25th in the league)
2003-04 : 17.2% (10th - Markov is young and not used as the main guy on the first wave yet he is 3rd for TOI on the PP by a dman)
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2005-06 : 19.2% (5th in the league - Markov first productive season on the first wave)
2006-07 : 22.8% (1st)
2007-08 : 24.1% (1st)
2008-09 : 19.3% (13rd - not sure what happened)
2009-10 : 21.8% (2nd)
2010-11 : 19.7% (7th - Subban first season Markov played only 7 games)
2011-12 : 14.3% (28th - Markov played 13 games only and Subban had a down year in term of goals in his sophomore season)
2012-13 : 20.7% (5th)
2013-14 : 17.2% (19th)
2014-15 : 16.5% (23rd Markov is 35 and slowly aging)
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2015-16 : 16.2% (25th - Markov is not in his prime anymore)
2016-17 : 19.7% (13rd - Old Markov and Weber)
After that we hovered in the middle of the pack for a few years under Weber/Petry and we are here today. We also had great "sidekicks" back then in Souray, Petry, Streit, Hamrlik .... The first priority of KH if Reinbacher doesn't develop as a good PP quaterback will be to acquire one.