You guys are all right with that fluctation thing.
But the Cap drop of LWBlue mako just experienced is a scheduled one, not because Orange was getting less players - it was already almost unpopulated.
At off peak hours, Orange and Blue have fixed a cap of 250 and 200 respectively, regardless how many people are in. A few mins ago LWBlue had a popuation of about 150 players, while there were about 25 in Orange.
At a certain point each day the two arenas resort back to their dynamic capping. LWBlue goes back to 120.