The problem with your statement is that it lacks context.
Crosby finished the 2009-2010 regular season in force while recording 21 pts in his last 9 games (2,33 PPG)
Crosby had 65 pts in his first 38 games in 2010-2011 (1,71 PPG)
Crosby had 37 pts in 22 games in 2011-2012 (1,68 PPG)
Crosby had 56 pts in 36 game in 2012-2013 (1,56 PPG)
Crosby had 104 pts in 80 games in 2013-2014 (1,3 PPG)
As you can see, Crosby was on a torrid pace at the end of 09-10 and it simply continued into the 2010-2011 season and after. You can't tell me its all of a coincidence that the guy had crazy hot starts in 3 straight years. He wasn't "hot" during those 38 games at the end of 2010, it was just his normal level of play during those years. He was just that dominant and it really is a shame that he got injured. Had he not suffered these concussions, he would most likely be defined as the consensus 5th best player of all time today.
Its totally debatable which one peaked higher on level of play alone. However, if you take full seasons, it is not.