There were a few times in the past where someone went from normal user to admin, I think there was 2 or 3 cases and each being extreme.
Even though it is unlikely and very unusual, it's technically possible under discretion of the leadership. That decision would most likely have to be approved by Highwon. We usually don't do this, but as the others already mentioned, this happened before. So yes, technically there's the possibility.
One of those unusual cases I mentioned in my previous post. It happened before, and it happened again. It's rare, but nothing we haven't seen before.
Same principle. He skipped a rank and went straight to the one above. Also - you don't apply for admin. Leads choose who gets that sexy dodger blue.