My money is on both.... Due to the bad system for controlling how people are added, a group of people figures out the nuances and repeatedly exploits it all night with full ilum buff (were talking from about 11pm - 2am local time, so 3 hours of straight 5 minute wins)
The only down side for the cheaters is that the warzone is flagged for closing due to player imbalance, so they have 2-3 minutes to rack up as many medals as possible