It's funny but I always think of Holly Cook as the skater who accidentally won the world bronze in 1990 over Kristi Yamaguchi. Holly never even made the USA world team again. So I never really paid attention to her. Now I will need to go back and watch her 2A.
About the double axel edge isssues, you are right that it's not like the lutz/flip issues, since the skaters absolutely has to take off from the forward outside edge for the axel. Dick Button often talks about that treacherous forward outside edge which is harder to control. In pairs we see a lot more falls/problems on the 2A because I believe the skaters have less time to practice it.
IMO some skaters just struggle with the axel jump, and so they never make it to the world level. The 2A does require 2.5 revolutions, so it is considered a difficult jump. IMO we don't see many falls on it because only the strongest survive.