Since the numbers below each mini is the total number of that mini used in the scenario, I a strongly leaning toward 0. In other words each tile that has x3 beneath it has 2 minis on the board and 1 mini in the available pool. That is what I am going with, but I would still appreciate a thumbs up or down.
For Mission 12: The purge, there are 9 villain minis on the board and 4 in the available pool at the start of the game. How many should be in the character pool? 0 or 4? It depends on where the available pool is drawn from the box or the initial character pool, which is not covered by the mission book rules.