Honestly, I think that's paranoid. The match is only 8 minutes real time, it's hard to imagine a player who can contact friends to coordinate them with expert timing. Who knows, maybe he used FB messenger and messaged all his friends.
Get more friends in game, try to find friends of many levels and leagues, and only if you think they are currently active. Friend request managers you see supporting other players, since you know they show up as fans. M
Edit: I've got a few over 100 friends, some games I have 5 fans, sometimes 0, usually 0-2. It's just another detail to manage.