Oh, did you really miss out all so-far posts about “faction wars” and “SK faction”?
The thing is, with at least 4 alliances ganging up at the top, they face at most 2 real opponents in any season. That means, any non-SK-Apo-NATO-RL-… allied alliance will face 4 opponents which cooperate, switch members, don’t attack each other (or only for a fake-war that ends with 10k skulls in total, also known as fiefdom-dumping/sharing).
The 4 can easily balance it out to have some players or whole alliances completely inactive, concentrating the most-effective members wherever they need them, and chances are high they eliminate one opponent on day 1 already, by attacking all their 3 starting fiefdoms in parallel. You can hardly defend against that - sure, you can try to get your top3 raids in 3 wars, but you just can’t grind 3 times as much as they do. And when I say 3 wars, that already implies not attacking back any of their fiefdoms, so a very defensive no-fief-gain-possible strategy.
And if you try to win one of the wars, they will do their best with member switching to remove any “easy” high-skull targets or less active players and replace them with the most eager grinders/skull-farmers.
To see their strategy in perfection, just watch a replay of war season 2 linked in some other topic.
So, even if e.g. VL and IL try to ally and cooperate, they’re at a 4 vs 2 disadvantage. And while you see 4 SK faction alliances at the very top fiefdom-wise, they have more allies than just those, so even more potential for switching
Thus, even for alliances at the very top, it is hard or impossible to beat that faction. Any others will fail obviously, as they can’t even beat those bases even with scrolling, so they surely can’t win in the game that is called “collect the most skulls”.
And, don’t forget, if necessary, players will grind to 3k skulls and beyond, and intense high-/top-lvl alliance wars can quickly turn into a gem-battle that is about buying food and scrolling to beat the hardest, highest bases in RR2 with bugged spells, so it’s not just like “well, everyone do 3 more raids and we’ll win this!”.
Anyway, this cooperative, slow growth (compared to a single-alliance higher growth attempt) assures that any league is always mostly filled with SK faction alliances that are not fighting each other, but always help each other, giving them a decisive advantage.
Also (again, watch the replay mentioned above), they will eliminate their one or two opponents in 2-3 days, meaning they don’t even have a single war on days 3-5, giving them effectively a “2 day war, 6 day break” cycle, compared to “5 day war, 3 day break” for any competitor. And, if any of them lost any fiefdoms, others will share theirs after the opponents are eliminated, to assure the faction stays together in the top league for the next season, while the non-SK-attacker (-3 fiefs) will be sent down again. So even by concentrating on one of the SK faction alliances, you can hardly make that alliance lose any fiefs at the end of season.
The argument of “it slows down their progress towards 90 fiefdoms” is pointless, as - while higher lvl boosts definitely are stronger, yes - one lvl more or less doesn’t make much of a difference anymore. With nearly maxed out bases and waves, the current boost lvls are more than enough to make their bases “a hell” if properly built. Also, obviously, the slow-but-spread-growth strategy requires much less effort for SK and also prevents the “pick the weakest ones off to make a hole into their faction” idea.
Last but not least, any non-SK alliance moving up the the top-league vs the SK faction has had a tough last season (winning the 2nd highest league), while SK had (see above) relatively few effort and a much longer resting period. This also creates situations where their opponents give up from the beginning, knowing there’s no chance of victory and saving their ingame and real life resources for next season, thus of course also making the SK faction’s required efforts even lower.
Summing up, SK’s current strategy seems mostly optimal to me.
No matter whether or not it is good or bad what they are doing, for sure they are doing it efficiently.