NYR aren't trading Lafreniere. Really doesn't matter who is coming back from the Leafs because they all make way to much money for NYR to actually fit in.
Marner is a good player, but this solves none of NYR problems. Value sure okay. But NYR not trading Laffy or Schneider. These are the core moving forward.
Rangers decline. Rangers cannot afford Marner's cap hit and/or next contract. Laffy is also 4.5 years younger and Ranger fans are hoping he can grow into the same offensive threat Marner is.