For what purpose, though? Why does he need the former villains/still villains to battle themselves?
Maybe Hyde would see it as a good cause? Like he thinks he represents the strongest and dominant aspects of Jekyll, and feels like the other dark entities need to be freed from their cages, so to speak.
#Bingo!!!
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"If you go as far as you can see...you will then see enough to go even further." - Finn Balor