I have never seen that many in one place. There most likely be fighters associated with each so a lot of them. Fighters don't show up on the tracker. So, some massive movement of fighters is my bet. Could be just an exercise, but as I said, I never seen that many. And all without a call sign is ??????

It means absolutely nothing. They do this type of training all the time. People plane fag this stuff all the time and don't understand that it's routine.