Nothing show that. Akatosh is like a metronome, it give rhythm but just because somebody decided to play by his own tune, it won't affect the metronome or the rhythm it's giving. It's shown in the myths that the et'Ada ask or learn about away to live longer and not make mistakes, implicating that each and every et'Ada can choose to die or make mistakes.
That's what the young gods are doing, making mistakes. It shows when there is more then one because they're all doing different things with time but each is only doing so in it's own region. It's how the Tribunal shielded Morrowind from the Dragon Broke, just as each of the Numidia which were being used in different area's.
Again, that is really too simplistic. You're not looking at the metaphysical big picture. You're not coming to any logical conclusions, but rather just reading the books. You may be extracting the clues, but you're not connecting it.
Here is what we know:
*Before Mundus time wasn't linear. There were a much of twists and turns and all were connected. The gods could escape death by simply jumping into another time stream where they weren't dead.
*When Mundus became linear, that ceased to be. All those timestreams became separated by big brick walls. There was an obstruction. Because of this, the gods were stuck in whatever timeline they happened to be in.
*Mannimarco, the Tribunes etc all became gods by somehow removing that barrier. They took it apart and found a timeline in which they were gods and were never mortals then merged that timeline with their own.
*This kind of action disrupted the status quo, hence the dragon break. That's why the Jills have to "mend things". There are two universes in place when there only should be one. I can bet that if someone looked hard enough during a dragon break, they could find another version of themselves running around somewhere.