yes, having 3rd junior grade at the age of 4 is impressive indeed. but you can't make a prediction that she will be jumping quads, because you never saw a 4 yo girl that jumps that high.
honestly i don't understand why you watching all of this. you can't really predict who will be amazing in seniors even based on the results they show at 10.
do you enjoy their performances?
watching a programs of a 10 yo is extremly boring to me. there is some rare exceptions at 11-12, but not from younger girls, they all are so rough and unpolished
Well, let's see. Of course, 4yo is way too early to predict for anything. It's almost a total waste before seeing double jumps. But this girl showed great development during 2 months(She was not nearly as good at anything when I saw her for the first time in late December) so she's someone I'll keep at the back of my mind. And she's 2 years ahead of the pack already. Chances are, in a few years we might be able to say something more ambitious regarding her.
10yo is actually a pretty good age for projection. The girls will already be jumping triples and you can see some hints of how they will be. Akatieva for example has the fastest rotation speed in the world and trains quads. And is under Eteri. There it's very easy to predict quads for her. This point where they have all triples is really when you can pretty comfortably project them otherwise as well.
For the younger skaters... The truth is, I don't really enjoy watching the vast majority of them at all. I just watch someone skate for a few seconds and if they don't catch my interest, I skip to the next one. It tends to only take 2 or 3 seconds to notice if someone's actually good, and 99.9% of them are not, at least by my standards. In any case, there are some skaters who I follow simply because I enjoy watching them skate and those are who I usually watch for(These also tend to be big talents, coincidentally). Otherwise I just skip from skater to skater until I find someone who I'm going to add to my pool of skaters to follow(Very unlikely this late in the season). Still, that's the reason for watching - To find that next gem.
As for performances by such young skaters that I actually enjoy,
Ksenia Melkumova's I enjoy watching the most. She's got tiny jumps which means that there's a real possibility she will never amount to anything in singles, but the skating and footwork just are too beautiful. At least she'll have a bright future as an ice dancer if she can't get her jumps in order.