So I just watched the ending segment again.
Couple things I picked up:
1) Apparently Sephiroth wanted to use the planet as a sort of vessel/ship to travel across space, and then seemingly find a new planet to inhabit, one more suitable. He states this is what Jenova did. But, I thought Jenova was an ancient. And that ancients were the "first humans" to live on the planet originally. So this is suggesting that ancients were actually an alien race that inhabited a lifeless planet. Thus, implying everyone including Cloud had ancestors that were ancient, which were originally from a different planet...woah.
2) I never 'got' what Aries was praying for in Final Fantasy VII. They said she was praying for Holy, yet Holy never came at the end of FFVII. Lifestream is what saved the planet against the Meteor. However, the thing that cured Geostigma, the rain. Was that Holy? So Aries' prayer finally kicked in--two years later?
3) Oh, to Himuro, who said the fact that how all the FF7 characters showed up all of a sudden during the Bahamut fight scene. There is an explanation for that. When Cloud's cell-phone is in the water you hear Reeve calling through. He says he got word from Reno that something is going down in Midgar. Apparenlty he gets everyone together on the Highwind (version 2) to go there. It seems at the time of the call, they were picking up Yuffie because you can hear Wutai elders talking in the background.
About the wolf thing. Yeah, it seems to be a representation of Cloud, as opposed to Zack.