Everything but the last part makes sense to me. As much as I want McSally to win, by every metric I can compare her to Mark Kelly, the Democrat's real wunderkind, he has an absurd lead.
Starting with the most important indicator IMO, preliminary votes: Mark Kelly won an uncontested primary by a total of 665,620 votes. For comparison, this is more than Hilary and Trump won their primary runs combined, and more than Sinema won her primary by over 200,000 votes. In a contested Republican primary, McSally sweeped... with 551,119 votes.
Then there's social media engagement. Mark Kelly has nearly double the Twitter followers and far more Twitter engagement than McSally. Mark Kelly's website, according to Alexa, is around ranked around #224,000 in most engaged websites. McSally's... is at #1,065,279. For comparison, Trump blew and blows away the engagement of Hillary and Biden.
Finally, fundraising. I don't usually think this matters--money, as far as I've seen, doesn't really correlate with political success. However, Mark Kelly, whether legitimately or not, has at least $10 million dollar donation lead over McSally.
I say all this not because I want Kelly to win (he's a snake in sheep's clothing), or because I think Trump will lose Arizona. I think his chances are about even with Biden right now but will grow as time goes on. My conclusion is that McSally can't be boosted by Trump's general popularity; meanwhile, Biden can't be boosted by Kelly's abnormal popularity.
Arizona's turning purple, at least outside the presidential elections.