I was going more for the fact he never had another 30 goal season after 30, and never a 20 goal season after 39
If Marleau is still scoring 20-25 goals past 35 and he's paid appropriately, you'll be happy with it especially with the accolades that will come with that if he stays a Shark. He only needs to average 23 goals over the next five seasons to hit 500. And if he miraculously finds a way to stay as durable and play another 8 seasons, he'll be the all-time games played leader.
Yeah I was about to say that... Thornton's career was probably something between Alfredson and Oates...
Oats was a little too weak on the goal side of things and Alfredson may have been a little too heavy
Oates is more comparable because of play styles. Alfredsson wasn't nearly the puck hog that Oates and Thornton were and those two were dedicated setup guys whereas Alfreddson was a lot more balanced as a goal scorer and a setup guy.