Actually, as far as why SE didn't expound on any love thems.. I've already seen a great many fans get all bent over the fact that Cloud's love for Aerith isn't specified and that Zack is with her. At the same time, other fans are desperately searching for hints of love for Tifa. If they would have specified that he loved either, the result would have been a bigger backlash than with FFX-2. It may sound stupid, but that's just how stupid alot of FF7 fans can be. FF7 is the fanbase's golden child. To screw with anyone's preconcieved notions of these characters would have been suicide for the movie.

Personally, I always found that Tifa was better for Cloud, just like Quistis was more suited for Squall. But I like how they state nothing. Them not making any obvious statements allows the viewer to keep whatever notions they had for the characters.