More little hints.
Tifa shows absolutely no reaction to seeing Cloud again.
When the camera guy tries to get Tifa to ask Sephiroth to take a picture, he also asks her if she can ask "him," too. To me, that's clearly referring to Zack, because he wouldn't have any issue asking Cloud himself for a picture.
Now off to Mt. Nibel!
Also, for fun, if you try to mess with Sephiroth's equipment in the menu, he'll just go "..." at you!
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"Hold on a minute! That testimony stinks!"
"Witness! You can't just say 'Hello' and expect us to get anywhere! I want you to testify!"