Regression is a real thing and it's already baked into the Kings season point total line by the models the books use, that is why it is down despite adding Fiala for nothing off of the roster last year and the return of Doughty for (hopefully a full season)
With Kopitar it is age, the people who come up with these lines know that an age 35 season can see great fall-off for any player, especially one with the mileage of Kopitar. Really, any season after age 33 can see a big fall-off for a player.
They look at stuff like this
Ryan Getzlaf
Age 33 - 56GP, 11G, 50A, 61 Pts
He never sniffed point per game again over the next 4 seasons, there was no 70 point decline. Getzlaf went from an 88 point pace to a 55 point pace over one season.
Jeff Carter
Age 33 - 27GP, 13G, 9A, 22 Pts (39G, 67 Point Pace)
Age 34 - 76GP, 13G, 20A, 33 Pts
Carter had been a consistent 60+ point producer until he suddenly wasn't.
If anything Kopitar is living on borrowed time. And as others mentioned, the defensive metrics already began to slip a bit last year.
There is certainly the chance that Kopitar pulls a Bergeron and has two more years, not saying that isn't one of the possible outcomes but he is certainly a prime candidate for age driven regression.
With Danault it is more cut and dry and why he is on mine (and basically everyones regression list). Last year Danault had a career high in shots, shooting % and obviously goals. And these weren't moderate career highs, he blew everything out of the water in comparison to his previous career totals.
If Danault were to generate the same 194 shots on goal (2.45 per game) he had last year (which I think is very unlikely), and shoot at his previous career average of 9.4% he would produce 18.2 goals.
If Danault were to generate the the same 1.66 shots per game (136 over a full 82) he has averaged since his age 24 season but still maintained the career high 13.9% shooting he had last year he would score 18.9 goals this season.
If Danault were to return to his career normals in both areas and shoot 9.4% on 136 shots he would score 12.7 goals.
The Kings system does funnel the puck to the net more than most teams in the NHL, so it is likely that he does exceed his Montreal shooting numbers again, but 194 shots is very unlikely. If he were to put up 160 shots for example.
Career shooting % before last year on 160 shots = 15 goals
Last year shooting % on 160 shots = 22.2 goals
Previous year shooting % on 160 shots = 10.8 goals
It's just hard to come up with a model that finds 27 goals again for Danault, and really anything close to that.
Plus it is very unlikely Danault plays 18:08 a game next season, if he does it means QB looks just as awful as he did the year before and obviously none of us expect that to be the case.
It is just very likely that Danault had your classic career year. For a guy like Kempe who was 25 last year you can more fairly call that a potential breakout year, but breakouts in age 28/29 seasons are just much less common.
I have Danault at 15-20 goals this season.