You seem to badly want this conclusion, but the data doesn't say that at all. You can't take the results of a bunch of 3-0 matches and conclude anything. The "effect" of the player is so much stronger than faction, map, rng, or any other factor.
You absolutely can; I've shown this multiple times now. A single 3-0 match concludes nothing, a TON of 3-0 matches actually concludes a lot, provided most (or all) players play each faction an equal number of times. The effect of the individual player is mitigated almost entirely because of the number of games AND due to the random 'side' assignment.
Here's an example: a 12-match/5game series between 3 players (A, B and C), where A is very skilled, B is intermediate, and C is new. Let's also assume there's only 4 factions (Sov, USF, Ost, OKW) in this example, and players chose to alternate when they can (Sov -> USF, Ost -> OKW). For the sake of simplicity, let's say that only 2 factions are allowed per "match", otherwise calculating totals gets crazy, and we need a lot more games for the example to work (So Match 1 / Game 1-3 is always Sov vs. Ost, and Match 2 / Game 1-3 is always USF/Ost, etc.). I think this is reasonable, since the actual series had 84 games, not including the round-robin matches; we're using a total of 36 games (12 matches x 3:0 games).
Lastly, since these are horribly stacked games, let's assume any win is a clean sweep - 3:0. This pretty much describes my "worst possible case", except that each player has played each team an equal number of times.
Match # | Allies | Axis | Winner | Faction |
Match 1 | Player A | Player B | 3:0 Player A - B | 2:1 Sov/Ost |
Match 2 | Player A | Player C | 3:0 Player A - C | 2:1 USF/Ost |
Match 3 | Player B | Player C | 3:0 Player B - C | 2:1 Sov/OKW |
Match 4 | Player B | Player A | 3:0 Player A - B | 2:1 Ost/USF |
Match 5 | Player C | Player A | 3:0 Player A - C | 2:1 OKW/Sov |
Match 6 | Player C | Player B | 3:0 Player B - C | 2:1 OKW/USF |
Match 7 | Player B | Player A | 3:0 Player A - B | 2:1 Ost/Sov |
Match 8 | Player C | Player A | 3:0 Player A - C | 2:1 Ost/USF |
Match 9 | Player C | Player B | 3:0 Player B - C | 2:1 OKW/Sov |
Match 10 | Player A | Player B | 3:0 Player A - B | 2:1 USF/Ost |
Match 11 | Player A | Player C | 3:0 Player A - C | 2:1 Sov/OKW |
Match 12 | Player B | Player C | 3:0 Player B - C | 2:1 USF/OKW |
From what I understand, this is pretty much what you've described as 'bad data' due to selection bias. The player's skill isn't matched well, so the games are always massively in favor of one player, and always 3:0.
Now let's look at the totals.
Sov vs Ost | Sov vs OKW | USF vs Ost | USF vs OKW |
3:3 | 6:6 | 6:6 | 3:3 |
Sov Wins | USF Wins | Ost Wins | OKW Wins |
9 | 9 | 9 | 9 |
Despite the
players being horribly matched, the
faction win/loss ratios are perfectly even. This is because for every 3:0 match between the uneven players, the
factions actually win 2:1. When you average this out over enough matches (this is just 12), every 2:1 USF/OKW match ends up being balanced out by a 1:2 USF/OKW match - resulting in 50:50 win/loss ratios.
Conveniently, 50:50 is pretty much what we saw with Sov/OKW (54.2%), USF/Ost (54.5%), USF/OKW (53.3%), and even UKF/Ost (40%). Since we know that the vast majority of games were 3:0 (or close to that), it aligns my theory on even distribution. The better player always won, but over time, their wins with each faction/side balanced out.
So how do we get to 71.4% for Sov/Ost? Could the Sov player consistently be the better of the two? This is possible, but given the outcomes of the FOUR other match-ups, it's unlikely. I think it's much more likely that the 'worse' of the two players happened to win a few times due to game balance.