Centre depth is the most important thing in the NHL and the Leafs have three of the best. John Tavares is 3rd among NHL forwards in Goals Above Replacement averaged over the last three seasons. Auston Matthews is currently the best goal scorer in the NHL. Nazem Kadri would be the #1 centre on several NHL teams, and is easily top 20-30 at that position. He is one of only three centres to score 30 in each of the last two seasons.
In addition to having one of the NHL’s best teams, the Leafs also happen to have a ton of cap space for the upcoming seasons, about 20 or so million’s worth, once they move Nathan Horton to the LTIR.