There is an ongoing issue with the dynamic map control type events, such as the battles for control of Kessex Hills: They never actually go anywhere. That is to say, despite these being ‘ongoing’, the fact is that the Seraph never lose any events because PCs always run in and keep the point under friendly control. Not one territory in at least the low level areas ever changes hands. Not one ancillary event ever gets won by the antagonists either (there is a ‘stop the centaurs from rebuilding the bridge’ event in the same area, and that bridge is never up).
This also creates issues with renown events in the area, since the options to kill the enemies are not available since they haven’t taken the zone (Aid Fort Salma). So instead, you run around waiting for traps to spawn so you can disarm enough to satisfy the quest, which is dull and repetitive, not to mention kills immersion when you see traps appearing right in front of you.
The basis for the enemies winning these types of events cannot be that the players are not there, because some will always be there. These events need to eventually increase in difficulty to the point where the players lose or at least to the point where you need more than just 10 random players who were in the area to come in order to win. I realize that you want to avoid griefers throwing events, but having events that are not able to be lost except by people not showing up is no fun either, and whole blocks of story DE are never happening because there is never a need for them to occur.