You right they don't. But following the "line of thought" in the discussion that was taking place. The idea you expressed was "don't get excited about younger girls because a lot can happen as they grow older" which comes with usual list of issues. you gave examples of Gubanova and Nugumanova. my point was that in their case the down-spin was not because of "those typical issues" (puberty, weight, growing, injuries, any physical/mind issues) but because they had "coach issues" and made "miscalculations". no biggie, just clarifying.
With Gubanova the situation is even more unclear. I think the puberty does have a part in it a little bit. She already started being inconsistent during her second junior season (2017-18), for example being fourth at one of her JGP event, and she switched coaches only after that season.