True to that, with proven top tier vets, their experience and professionalism may do wonders for the young players on and off the ice.
One other thought has to come my head, may be the Leafs are trying to seriously win the Stanley Cup within the next 2 years. You got Matthews, Marner, Nylander and Kapanen cheap for the next couple of years. After that you got to pay out big contracts for them. Even Lou Lamoriello said he only has the luxury of making these types of signings now. In a couple of years he said it would not be possible.
But then again, I am skeptical of Lou, sometimes I think he is not that honest. He goes on to say that the Leafs don't have a salary cap issue, even though they are $2.5 million over the cap at this present moment and still have a couple of RFA to resign (Conner Brown).
https://www.capfriendly.com/teams/mapleleafs