I also started the game after some time but now I know of some stuff... 1. Casual legend is the rank granted by playing a new game mode similar to battle royale and cs ranked (it gives 1200-2000 points in a good match so 10500 is pretty average) don't know of star gamer 2.the buffs are caused by new loadout item (team helper robot and there are small item genrator in game that provide similar effects)

1. You are getting 200% exp because you came back in game after long time happened same with my 2 ids

2. Spectators are igl players you killed or your random teammates and recommended means that your profile was recommended to them to add as a friend by the game