to under stand why i have his jutsu work this way you'll need to read this:
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Guy: i have no choice but to use the night time moth.
madara: so you still have a dance move left?
guy: thats right this is the last one so LET'S TANGO!
Guy takes a stance standing on one leg his arms out like wings, moths start to appear as if out of thin air. covering his arms. madara starts to see random faces some he's never even seen. he see's izunas in the mix. neji, jirya and asuma even appear.
madara: What is this are these the faces of the dead?
guy: thats right and we're about to join them.
guy disappears appearing behind madara and he punchs madara he blocks but see's izunas face and is knocked over guy then appears above madara and sends a kick to his stomach he see's nejis face this time.
madara: ( i've never even seen that ones face is he using the force of the dead to attack me?)
Madara repels guy with shinra tensei and jumps out of the hole that was made from guys last attack. but guy appears infront of madara punching him in the face as he does he see's jiryaras face. guy runs around intercepting madara as he flies backwards from the previous hit elbowing him into the ground as he see's multiple dead shinobi some of which he killed.
madara: I get it as you draw closer to death you contact the dead spirits and use their power to increase your own.
guy: thats right and with the eighth gate active i'm basically already a corpse about to join them thats why i can do this.
Guy charges at madara who charges back at him guy pulls his fist back a single moth appears one his fist. madara puts the black orb in his hand like a rasengan. The two attacks clash. Madara can see multiple ninja who died in the war behind guy but all of them start to disappear until only one is seen behind guy his father. guy breaks through ripping madaras arm off aswell as his own. madara only stands laughing at his own pain.
Guy: that was all i had left...
guys red steam disappears and he begins to fall to the ground only to be caught by naruto who we can't see yet.
Naruto: bushy brows sensei thank you, i'll make madara pay.
sasuke appears next to naruto his eyes closed.
madara: so you two are alive after all.
naruto can be seen in full now with a tentails jinchuriki cloak and sasuke opens his eyes to show the rinnegan.
guy gives naruto a thumbs up.
guy: do it naruto beat madara i know you can do it.
guy dies smiling.
end