As much as I agree with all the evidence you presented on Cloud and Tifa's relationship, there are some quotes in the list that seem to be leaning toward Cloud x Aeris.
This makes it sound like Cloud's feelings only match because Tifa's affection is high. Meaning that Cloud only loves her if the player does; not because it's part of the game story.
And this makes it sound like Cloud would have been better off and better matched if he had ended up with Aeris instead of Tifa.
I hate to play devil's advocate because I really can't stand Aeris as a character, but you can see how I have my doubts.