What they did notice was that Aeternus was the same. He hadn't changed like them. He was exactly the same as he was before they finished comprehending the Supreme law. His potential hadn't changed at all.
They didn't know if that was good or bad. It could mean that he wasn't shackled before and possessed his full potential. It could also mean that he is still shackled, but he is not a creation of the void universe like them, so comprehending the Supreme law of order couldn't unlock his potential.
They were thinking about it when they suddenly began to ascend. All nine of them were ascending. Their eight physical bodies were also moving with them. Physically, they were descending into the dark side of the void universe. That is what anyone will see when they look at them.
They look as if they are being submerged by the law matrix and sinking below it fast. But that's not what it looks like from their perspective. To them, they are rising up above others.