I had a feeling he wouldnt make it in the war, too much bs was going on with neji, kishi was hinting towards it.
Neji running out of chakra fightning the zetsu
Zetsu turning into Neji to attack Sakura's campsite
Then having the rotation convienintly be extremely helpful against the Bijuu's hands.
It was all a matter of time before Kishi took the final step in killing off Neji