COA leader for alliance holding zig unlocks a fast burn skill on flags that lasts 1 hour. Cool down 24 or 36? Hours or something for 3-5k gems.
After zig capture, KVK is basically over. Then building for end game rewards begins. Typically leadership and very few amazing KD members have the burden of building and burn through zones AFTER a KVK has essentially concluded.
Fast burn skill will help ease that burden and keep more engagement with people knowing that territory may be getting burned sooner.