I think for Landeskog it's fair to assume that as he enters his prime his A1s will increase. It seems to be a trend, but I have no mathematical proof because I simply don't know how to do that. Maybe I could chart A1/A2 ratio vs Age. I'd assume there's a peak at around the 3rd/4th year in the league, or maybe the age 25/26 season.
As for Corey Perry, he's also had a drastic drop in A1s. 0.95 to 0.66 to 0.47 (per 60 mins) over the past 3 seasons. That's very concerning.
Then you have old guys like Ray Whitney and Kimmo Timonen just skyrocketing their A1 totals. I don't really know what to think about all this...