Hello!
Congratulations on the AC invite! I totally understand your perspective, and I remember feeling the same way when people would post about offers when I was still waiting to hear back post-AC.
When I completed my DTC AC for
Reed Smith, I believe I was one of the later (if not the latest!) ACs, as I had to reschedule due to a clash with a VS. Firms wouldn't continue running ACs or invite candidates if there were no realistic places left, and offers going out early doesn't mean that later ACs are judged more harshly.
It's also worth bearing in mind that online posts can be misleading, as they only show a small snapshot of what is actually happening. Firms expect some candidates to decline offers, so they may plan their recruitment accordingly. If you have been invited to the AC, it is because the firm sees potential, and that doesn't change just because your AC is later in the cycle. Graduate recruitment teams know that there will be strong candidates at the later ACs too, so there is definitely still a chance!
Best of luck with the AC!