it's the only way tbh. i thought Chiyo was the only one that could use the reincarnation technique, kinda like a KKG. because, i think the 3rd would've did it for the 4th if he was able. he had a weird old guy crush on him. naruto keeps his word on them both dying. sasuke(kishi's fav) is redeemed. nartuto goes on to become the hokage(holding true to the original Naruto.). we get to see sasuke with the rinnegan. also, it's a heart warming/emotional way to end the manga series. like OMG FRIENDSHIP PREVAILS!