Q is writing about Dan, rather than Dan about Q.

Absolute nonsense. Why would Q write about Dan sending a tweet about Rush's death, rather than anyone else more relevant in hundreds of other people who tweeted at different times - or indeed not be writing about Rush himself?

You've picked the one 'rando' where the numbers happen to add up.

Even if we are talking about Dan tweet, which is more likely:
1 - Q has a magical crsytal ball that can tell years in advance when someone is going to tweet, down to the minute,
or
2 - Either deliberately or accidentally Scavino sent a tweet matching an old Q post.

Take some critical thinking