I understand the sentiment, but for Laf in particular it's clearly not true. After a good (but unproductive) playoffs, he didn't play less than 15 mins a night until game 15 and routinely got over 17 mins
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KK's hasn't been as good but it's still 14 of 18 over 15 mins and 5/18 over 17
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While lack of useful PP time hurts their numbers, they are getting the EV time so far this season to be difference makers, they just aren't doing much with it (but neither are the rest of the team)
EDIT to add: Laf is 3rd amongst forwards in EV ice time so far (Panarin and Trocheck are higher), and KK is 5th (he averages 5 seconds less than Mika)