This might be a hot take, but without taking any credit away from Lou's great work renovating the Islanders, time has proven that Garth Snow actually built a pretty solid foundation on the Island.
Barzal (and the G. Reinhart for a 1st trade that facilitated the pick), Lee, Nelson, Beauvillier, Sorokin, Toews (traded to Colorado), Pulock, Pelech, Czikas, Mayfield, originallt drafting Martin, Bailey.
Sometimes, an overnight success takes 10 years of work. Isles were also 100 point teams 2x years in a row when Tavares was still there around 2014 and 2015.