You mean that comm at 2am by spectre an hour before the base went down after a 50hour siege? I would for all intents and purposes call that too late yes. The rule says - demands must be reasonable. All you have to do, is do friendly RP and ask for demands just as siege starts.
Instead a defense was mounted with no RP as owner couldn't even find the time to post on forums... If someone with Core2+ plays it right, finds out who the strong group is they should ally with and fulfill all their demands and RP positive towards them yet the siegers still refuse well then there is a problem.
But come on - this just wasn't the case at all here
