Straw man argument. I never said that Kerfoot or Nylander are better than Matthews. Besides, Matthews post season numbers were impacted by Marner's ineffectiveness. Marner was even a liability at times.
However, I am saying that I think Nylander is a better overall player than Marner. It's not just based on their post season production. Nylander is a better skater, better sniper, a master of zone entries, he can win puck battles, he can set up plays, and he can defend. He is the more well rounded player of the two, and he has proven that he can elevate his play in the post season with less time and space and increased physicality.
Furthermore, if you factor in the ridiculous discrepancy between their salaries, I think it's far more beneficial to the organization to part ways with Marner and make better use of almost 11 million in cap space to bolster our roster.
If there was no salary cap, this would be a moot discussion, but in the current economic landscape of the NHL, having a soft skilled winger that disappears in the playoffs making almost 11 million dollars is not conducive to success as a team.