Nichushkin re-found his game at around 25 after a couple years as a bottom-6 guy in Colorado making peanuts. So we should be looking at 99-01 birth year players that at some point in the past showed not just promise but actual production at a high level, though maybe not the NHL yet, and for one reason or another aren't in demand currently. But we need fixable issues as well, like just not given a real opportunity or maybe an injury or two side-tracked their development.
Forsling is in the same category. A once good prospect, pulled off the scrap-heap for cheap, didn't really break out immediately but has in the last 3 years, at around 25.