by LeeB1985
Well for aesthetic purposes you could mix them so you have more different sculpts on the table.But if you wanted I'm sure you could increase the pool to over 10 if you wanted to increase the difficulty but it's rare the pool runs dry so doubt you'll ever be in a position where you'll have 20 cultists on the table.
Maybe further down the line we'll see an episode where you see two different groups of cultists competing to summer their own elder god.