Many clans have the problem, they weren't as active as they should have been and the eb is going bad .... They are running out of time. The idea of this feature is that players can open the mercenary feature and unload onto struggling eb's. This could be a nobility feature or a gold feature to list your clan for mercenaries, it effectively allows you to get people in fast when time is a problem Hope you guys like the idea
I think this is a case of clan organization more than anything else. Keep your members informed, make sure you'll have people online for the entirety of the eb, and above all don't push for ebs that you can't do yet. Clans that play together stay together, and that's one of the greatest parts of this game.
Or you can wall "helpsaveus" a mercenary clan that helps failing ebs and have people like me, a mercenary clan personnel, come help
Just because your clan cannot complete EB's above Destroyer, and if they try the mercenaries don't come help you, doesn't mean we need a feature to help small clans that have no chance of amounting to anything.