The synergy says that if the nickname is in the team, then it gives all team members + 10% to attack, and if it is dead, then the value is doubled (it is logical that up to + 20%)

as we actually see when nick is dead then the attack becomes less than when he is alive, but it should become more ...
+ 10% Attack Damage Corvus Medium Attack 7101
+ 20% Attack Damage Corvus Medium Attack 6261


I could upload a video of these two battles, but I don't know how to do it