I'm confused, why aren't you just using p/60 instead of using point per game then doing some sort of adjustment to an average of 15 mins of ES time? Seems really odd
For one, because people have a weird bias against P/60, for reasons they cannot justify. I (and others) have already posted P/60 numbers for them in the past. Also, P/60 numbers aren't as readily available, and many places that have it, don't split it up between ES and PP, or don't have previous years, or don't allow you to see multiple years at the same time, or don't allow you to see where they stand at certain points mid-season, etc. I used NHL.com, because they're great for everything except P/60.
This is also part of a bigger evaluation where I looked at historical players as well, and I already had to do manual adjustments for that. I adjusted to 15:00 ES TOI/GP because most players of this caliber hover somewhere around there. It essentially says the same thing as ES P/60, just in a different format.
ELCs:
ES:
Matthews: ES 2.60p/60, 2.29p1/60
Marner: ES 2.33p/60, 1.90p1/60
Point: ES 2.20p/60, 1.77p1/60
Aho: ES 2.00p/60, 1.52p1/60
Connor: ES 2.00p/60, 1.60p1/60
Rantanen: ES 1.98p/60, 1.44p1/60
Laine: ES 1.86p/60, 1.57p1/60
Meier: ES 1.92p/60, 1.48p1/60
PP:
Marner: PP 7.02p/60, 4.59p1/60
Matthews: PP 6.31p/60, 4.90p1/60
Rantanen: PP 5.67p/60, 4.20p1/60
Laine: PP 5.31p/60, 4.40p1/60
Point: PP 5.79p/60, 3.44p1/60
Aho: PP 5.07p/60, 3.47p1/60
Meier: PP 3.49p/60, 3.29p1/60
Connor: PP 3.71p/60, 2.73p1/60
It's hard with both P/60 and P1/60 (ie. Marner has better PP P/60, but Matthews has better PP P1/60), but I ranked them as best as I could there.
As we can see, Matthews and Marner rank #1 and #2 among these RFAs in ES P/60, ES P1/60, PP P/60, and PP P1/60.
I unfortunately don't have Tkachuk and Boeser on hand, but I see no evidence they would place anywhere significant on this list.