I mean think about it look at these characters:
Kakuzu = Naruto battled when he lost hearts before the battle began
Nagato = He couldn't use the strongest Pain thanks to fighting Konoha, meaning Naruto battle a nerfed Pain
Orochimaru = Sasuke battled a weaken Orochimaru
Madara = Naruto and Sasuke battled a weakened Madara due to him fighting 8 Gate Gai
There might be more but those are the ones I remember. It seems the main character battle ememies which gets nerfed due to being weakened.
Kakuzu = Naruto battled when he lost hearts before the battle began
Nagato = He couldn't use the strongest Pain thanks to fighting Konoha, meaning Naruto battle a nerfed Pain
Orochimaru = Sasuke battled a weaken Orochimaru
Madara = Naruto and Sasuke battled a weakened Madara due to him fighting 8 Gate Gai
There might be more but those are the ones I remember. It seems the main character battle ememies which gets nerfed due to being weakened.