We counting 7 way ties as leading the playoffs in goals? 3 way ties in assists and points as leading? I don't think you know what leading is, but you have to have more than all the other players to lead. And if Kopitar had an offensive dynamo like Kane on his team, he wouldn't have led in anything. He also wasn't putting up Selke level defense in that first run, while Bergeron had been a finalist.
Nobody said he didn't do his part offensively, but when he started focusing more on defense heavily, his goal scoring took a hit. Its noticeable in both the regular season numbers and the playoff numbers in his second run.