For all the flack the Core gets, no one outside the Core has stepped up.
Just check out production every playoffs.
Only against Montreal, where Kerfoot piggybacked on Nylander to get into the top 2.
Where is that "where did he come from" player?
Our depth has been awful in the playoffs.
Kerfoot - 4G / 9A / 13P in 30 games
Mikheyev - 2G / 2A / 4P in 19 games
Engvall - 0G / 4A / 4P in 17 games
Hyman - 5G / 8A / 13P in 32 games (but of course now he's a playoff god for Edmonton)
Bunting - 2G / 3A / 5P in 13 games
Jarnkrok - 1G / 2A / 3P in 18 games
Maybe I'm forgetting someone, but ROR with 3G / 6A / 9P in 11 games is the only secondary guy I can recall who truly stepped up (and big surprise, that's also the year we had our sole playoff win). Domi had a decent playoff last year, but not as good as ROR and it's a smaller sample size. Spezza produced well for a 4th liner, but was still just that, a 4th liner.
So I think 100%, our core forwards have been disappointing in the playoffs relative to other star players and relative to their own regular season performances (except Nylander, who's performed at about the level you'd hope/expect given his regular season performances).
But our secondary/depth forwards have been abysmal for us offensively too, and probably more so than our core. Compare that to what Florida got out of Bennett, Lundell, and Rodrigues, what Vegas got out of Barbashev, Karlsson, Smith, and Roy, or what Colorado got out of Nichushkin, Kadri, and Lehonen (if looking at the more secondary core/quality 3rd line players). Part of that is lack of $$ available, due to the core, to upgrade those parts of the roster, but I'd say they've underachievers regardless of that.