If for whatever reason the Fortress can't gather the Sylvans, maybe they're guarding Eastern Road or mudsexing in the weeds, they can count on the Warlocks for the "much needed" backup. I can say without pause that 75% of the raids that occured while you were logged on had you as a major player. You may be a small cabal, but one invoker with 5 other raiders is a pretty formidable force.