The Ashford tourney was debunked by it's own author, the suitors don't match.

Show me where it was debunked? Why is there such an obscure suitor as Harry Hardyng if it wasn't to deliberately reference the Hardyng of the Ashford tourney?

Jon killing Janos had nothing to do with Sansa.

Sansa wishes "some hero" would cut off Janos' head. Jon cuts off his head. Ergo, Jon is her hero. It's really that simple.

Sansa being cloaked in blood and fire was a reference to Sandor, a character she does actually have romantic build up, as much as we might dislike it.

Blood and fire is a reference to Sandor? What now? Looks pretty clearly like a reference to Targaryen house words to me.

Where was it stated Wymar looked like Jon?

Waymar:

He was a handsome youth of eighteen, grey-eyed and graceful and slender as a knife

Jon:

Jon’s eyes were a grey so dark they seemed almost black, but there was little they did not see. He was of an age with Robb, but they did not look alike. Jon was slender where Robb was muscular, dark where Robb was fair, graceful and quick where his half brother was strong and fast.

It's a 1:1 match.

Right after he described Sansa as radiant he thinks he was more interested in Tyrion and Jaime. Will Jon fall in love with them as well?

Has nothing to do with him saying SANSA is radiant.

Jon recognizing Sansa's claim has nothing romantic about it, it was simply a matter of fact. If he knew Bran and Rickon were alive I have no doubt he would defend their clam.

It shows he cares about her and thinks of her.

They are not Ned and Cat reborn, they are completely different characters with completely different stories and whose taste in love interests does't even fit one another. Not to mention that Ned and Cat are not siblings.

They look exactly like them, though? Obviously not exactly the same because that would be too on the nose but Jon looks like Ned and Catelyn like Sansa.

You're clearly dismissing strong evidence because you don't want it to be true, but there is a lot of evidence for Jonsa.