Check this:
https://forum.ironmaidenlegacy.com/s...l=1#post100352
Also fudjo had an amazing drop of 5* from this event. I've had different 5* dropping from large stacks too. You don't see it often because the odds are small. If, for example, the chances of a 5* are 1%, then seeing more than one of them in a stack of 10 souls is 0.4266% - and we're talking only about getting 2 (or more 5*), not different ones, odds for that are even smaller obviously. In other words, if you want to see at least 2 different 5* when you never drop more than 10 souls at a time, you would have to drop 234 times a stack of 10 souls. So yeah.
If you drop 99 souls with a 1% chance to get a 5*, your odds of getting 2 or more are roughly 1/4 (again if you want to see different ones chances are smaller), while your odds of getting exactly 1 are 37%.