So I haven't looked at the powerstyle for Multiple Man, but I had some thoughts on how to not only to make dupes follow Multiple Man, but how to remove them. In the powerstyle we just reference a py script, and in the script
spawn("_OWNER_", "newDupe", "dupe_temaplate", " 0.000 0.000 0.000 ", " 0.000 0.000 0.000 " ) #Create the duplicate
newDupeID = GetID("newDupe") #Get that duplicate's in-game ID
SetFollowingHero("newDupeID") #Make the dupe follow the heroes
SetHealth("newDupeID", [some number]) #Give them lower health
waitTimed(60) #wait 60 seconds
remove('newDupeID') #If dupe isn't already dead, remove them
To handle how many dupes can be created, the power usage would keep you from being able to duplicate too often. I don't know how we'd create it from the PY script, I'm sure there's a way.