Well, at the end of last season, Daniil did say that all of 3A would be trying to learn 3A's over the off season. My guess is that they ALL trained it, at least in a harness.
Nord Stream 2 said he saw Aliona working the 3A when he visited Novogorsk. Perhaps during the summer she couldn't land it when she tried it off harness.
Aliona also said in one of her early interviews (around test skates) that they had to work on her other jumps because she had grown over the summer. She also had her knees all taped up when they performed the SP at test skates, so maybe there were some minor injuries along the way too. Perhaps they set aside the idea of the triple axel for the early part of the season, but after the test skates, when
Aliona was told she might have to go to Junior Worlds, she decided she needed a high-difficulty jump ASAP.
If they had laid the groundwork over the summer, I think it's entirely possible that Aliona picked up the 3A again in a few weeks. On the NBC broadcasts, Tara had mentioned that when they talked to Eteri at Skate America, Eteri said that of the 3 girls, Aliona was the most fearful of the difficult jumps, so they have to move slowly with her. Maybe all Aliona really needed was the psychological motivation to conquer her fear, and the feedback from the test skates accomplished that.
To be fair, Aliona's 3A is still really not that consistent. Maybe 50-50%? But it does seem like it's getting better--at least it looked better at the first practice at NHK Trophy.
What I'm
now wondering though, is if her sudden success with the 3A was really a surprise for Eteri & team, or whether it was part of their plan all along.

I remember that before 2019 Worlds, there was something like Alina was saying "no" to whatever they said, so they kind of tricked her into wanting to go to Worlds by saying she didn't have to go...? Something like that?
So I'm wondering if they knew that Aliona could do a 3A (and that she'd need it to succeed), but because she was somewhat hesitant to try it, they needed to motivate her to do it somehow--hence the talk about having to go to Junior Worlds. I don't know; it's just a thought... I wouldn't be surprised if this were the case! :yes: