He should call you in through a decision. What might have happen though is this: he won't take that decision unless the plot is strong enough. But the 40% clan might have declared war on him. So on one hand it would be logical of him to call in the plotters at this point anyway, but the plot is also a sort of contract with the plot members. They join on the condition that the plot leader won't start the plot until they are strong enough, so they don't end up being dragged into wars they have no chance of winning.
Fro you as a player in this situation it's probably best to join the war anyway as it might be the last chance to beat the giant before he gets even stronger.
Fro you as a player in this situation it's probably best to join the war anyway as it might be the last chance to beat the giant before he gets even stronger.