PHILADELPHIA, PENNSYLVANIA - DECEMBER 04: Erik Karlsson #65 of the Pittsburgh Penguins skates against the Philadelphia Flyers at the Wells Fargo Center on December 04, 2023 in Philadelphia, Pennsylvania. (Photo by Bruce Bennett/Getty Images) The Toronto Maple Leafs have their entire defensive core returning next season, but that could change. Toronto has been linked to trading away from their defense, as well as adding to it. The Maple Leafs have been linked to Erik Karlsson of the Pittsburgh