Chara is a bit different as a defenseman because size and reach are more important defensively. Big forwards typically don’t age as well, regardless of when they break out, because there seems to be more wear and tear on their bodies. The exception tends to be more big players who can continue to use their size and reach to their advantage to protect the puck and make plays, like a Jagr or a Thornton. These players typically are capable of slowing the game down though and using their hockey sense as an advantage.
When big forwards like Thompson break out late, and especially with a huge jump like this, the sense of “growing into their bodies” suggests that being able to use their physical abilities at a high level is a big part of their success, and why they take longer tends to be because they were used to always being bigger and stronger when they were in lesser leagues and they took awhile to adapt. But if they can’t adapt quickly in order to be a useful player when they’re younger, I question how well they can adapt as they get older and move out of their physical peak.