I thought it was so sweet that Tifa never pushed Cloud into doing anything, and that she helps him find the answer on his own, instead of just telling Cloud what to do. That's what I loved about her character in FFVII, and in AC/RF they really talk about that being an important part of her character.
I always thought that since Sephiroth is Clouds darkness, (In KH) once he defeats his darkness (Which Sephiroth said was too strong), he will be able to accept his light (Tifa) which is currently too bright. I also think it interesting they have these two dressed in their AC outfits, and then make a reference to AC in the interviews saying that Cloud is running away from something warm like in AC. That to me, makes it make sense that he's running from Tifa in KH. Also, since their character designs were made to balance one another, did they use those same outfits to balance Cloud and Tifa in KH as well?