The only other evidence I can think of is the fact that in one of the trailers (I forget which and I'm too lazy to go look) there's an image of Aries and Cloud back to back in a scene which I'm fairly sure isn't in the original seeing as the two were never in a field of yellow flowers. this could be the two of them in the 'next life' or something.

What does Cloud say in Japaneses that makes you think he dies? I don't have the ear for the language?