In other words, if you earn a spot in FB, you earn it, not through luck, but through merit! I think this will add more dynamism to the games.
Just my opinion.
За то что нейтралы не бегают за единичкой, для меня это уже стоит того
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I don't know how it is for you, the organizers, but I personally am also "FOR" allowing participants from Factions Battle 3 to participate in the selection for Factions Battle 4. The goal of the tournament is to have the best players compete, so let them play and eliminate us (the contenders) in a more intense competitive environment.

+1 to Leader and Romych's statement, the selection should be tough.
Do as you please, it's your decision. If you want brutality, go for it (although I don't see what's brutal or cruel about it).
But if the FB roster stops changing after a couple of seasons, I'll be interested to see how you react.
As the next item on the agenda, I suggest we include a tournament for beginners; it could also benefit from a bit more intensity.

By the way, if you didn't know, Yur, there are quite a few strong players in the beginner league. So, there are no problems with competition there :)
I think someone already mentioned that a player who qualified for the Featured Battle cannot participate in the selection for the next Featured Battle. That would be more correct, in my opinion, because otherwise, all the current Featured Battle participants will start participating in the selection process at the same time as a backup, and what then? :)
So, there's no competition in the qualifiers, right? Are there clearly defined favorites who are guaranteed to pass? This has only happened once.