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.

Quote Originally Posted by Shishikabob View Post
If Tifa's affection regarding Cloud is high, when the two stay behind at the airship, they will confirm their matching feelings of desire/wanting to one another. This line is said by Tifa at the conversation's end. Immediately after saying it, Tifa forms a striking smile that summarizes everything."
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.

Quote Originally Posted by Shishikabob View Post
“Case of Tifa … first, there’s the premise that things aren’t going well between Tifa and Cloud, and that even without Geostigma and Sephiroth, it would still be the same. I don’t mean to get into my views on romantic love, marriage and family. (laughs) After ACC, maybe Denzel and Marlene can get them to. Perhaps things would have gone well with Aerith, but Aerith’s responsibility is big, I think.”
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.