Evvie has lost numerous times by people who find other ways to defeat her then brute strength. Plus the standard clones are only going to be in low intermediate tier where they probably can be overpowered by a lot of characters, so they will go down even easier then the real Evvie. They are tougher then waves of generic mooks, but can still be brought down in large quantities about as easily as bringing down the real Evvie by herself.