The point is: in the first round, GUNNAR could not possibly kill even one of my dragons.
Why didn't anyone notice this piece of text?.. The second part of the explanation, about the resistance, does sound shaky, I agree. But checking whether Gunnar could have killed at least one dragon, in my opinion, is not difficult at all. If he couldn't, then what is there to argue about?..
Added 5 minutes later
I mean that in this case, ordering a replay is the same as sending a player off the field in football for an incorrectly thrown throw-in.
This isn't entirely correct. If you send a player off the field in the 85th minute with a score of 7:1, it's unlikely to help you win. But ordering a replay of such a match for an incorrectly thrown throw-in...
You can open the saves and see if the situation is really so advantageous there and if this move really decided so much, even if it was actually a brilliant move