people asked last year for there to be only ONE in game currency, so GLU responded by adding more currencies called EXP, EVO, Prime EXP, and who knows what is next.
I spent 30K gold (20 boxes) and did NOT get him. I have gotten players of the week and month on my first try EVERY time. in 20 prime boxes, I got ONE 5 star player, but no prime.
you have to be in at start of event to collect, AND stay the entire event. to prevent this from happening again, promote EVERYONE to assistant. then anyone can kick strangers that join, and no-one can kick the other members except for the leader