None of us will (confidently) know.
I've done the math on this before... it's hard/brutal.
1. You have to make an Excel spreadsheet with all players owned, all data.
2. You have to total all the counting players stats and total them. Then you give them a "share" of that category. Maybe Dubois' 500 FOW / 50,000 FOW for everybody = 1% = 0.01. Sergachev obviously gets a 0 in FOW.
3. You have to total up the player's "share" score in every category.
4. Even after doing that, you have to compare apples-to-apples, which means you have to understand what F or D are available on the waiver wire, how much their cap hit.
For example, let's say you do 1-3 and you get the following:
33.2 Dubois
29.4 Sergachev
OK... you say - Dubois gives better total multi-cat score... I go with him.
Well - now you do apples-to-apples... you really have to choose a F+D for $10m.
So you go to the wire and see what's available:
7.3 WaiverWireF at $1.5m
1.4 WaiverWireD at $1.5m
Dubois (33.2) + WWD (1.4) = 34.6
Serg (29.4) + WWF (7.3) = 36.7
So in the final apples-to-apples comparison... Sergachev is the better choice because solid-performing patch-waiver-wire-Forwards at $1.5m (your cap relief maybe) are just way more plentiful and easier to pluck - ALWAYS.
That's a critical part of cap leagues...
What can you pluck off the waiver wire.
My GUESS (just a guess):
Sergachev is one of the rare 8-10 defensemen that can play PP1, and do BIG totals in HIT/BLK.
These are gorgeous players to own in multi-cat... and BLK are especially rare and hard to find.
(That said - so are FOW)
My guess is Serg's multi-cat-ness at a position where multi-cat-value is HARD to get (D)... makes him the better pick.
(If PLD was going to rake more FOW on LA... I maybe pick him... but Kopitar & Danault are still taking the Lion's share of FOW.)