Buoyed and clear third best player might be over-simplifications.
In the regular season, where many games are against non-playoff teams and the opposition cannot game plan for you as in-depth, because teams face a different opponent every night, sure. But in the playoffs, where teams can put a more precise plan against you and the competition typically gets tougher each round, Panarin was less and less visible and Lafreniere stayed strong throughout.
Lafreniere certainly looked like the best even-strength offensive threat for the NYR in the playoffs:
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While some of the stars wilted or got increasingly more reliant on man-advantage points, Lafreniere stayed solid, even as playoff opposition got more difficult.