Well we aren't expecting them to maintain their performance for another 5 seasons, we literally need them to maintain it for one season and post season. I would bet that Marchand, Bergeron, and Rask don't see much if any regression next season. Chara I wouldn't even want back and Krejci may slow down. A lot of Dallas' top players are similar age to these guys too. Pavelski 36, Radulov 34, Benn 31, Khudobin 34 and Bishop 33. Seguin older than Pastrnak. McAvoy, Gryz, Carlo very similar age of their D corps. They just went deep two straight years. Why can't our core, with a couple additions, not go deep again?