Thinking about it more, I think I know where our power will be heading, at least if it's following the trend of mixing the two to create a greater whole. Ella's style of constantly changing, working through our tails, mixed with Syla's ability to use the memories of others to replicate their powers. How? Technically, during her fight with Indra, Syla showed that she can not just use the physique of a monster to it's advantage, but that she could use their powers as well. It's only shown for a small part of the fight, but Syla was specifically trying to use Eisheth's powers (And I think she actually used Aos' but someone should correct me if I'm wrong) before Indra destroyed her memories of Eisheth's power. Additionally, those of Syla's kind can specifically use powers of other beings, superhuman or monster, even though her daughters only have the power of Memory. Even in the real world, though presumably at a high cost. Mix them together and what do you get? A clone army of beings you can replicate endlessly because unlike Syla, who had to use her true body to replicate their strength, we can copy enough high quality memories into our tails to use a power or two, without losing our original copy of the memories (Which is probably why Syla could only use a memory until it was destroyed, as that either severed her connection, or more likely destroyed the memory that she was using. The latter would explain why when we were escaping from S.I.N. that Syla said, "You still remember Goliath," because most of her exceptional memories were destroyed in her fight against Indra.)
Of course, that could all change depending on if we are simply going to follow the 3rd or 4th's desires for us, or if we're going to commit fully to breaking free like how the judge in the Truth path said that we could. If anything, that might be the real turning point, whether we let ourselves evolve in a deadly situation, or whether we die, but use our powers in the dream world to somehow activate Nyx's mark and allow ourselves to be reborn as something potentially more that what either would allow for. Could be an abnormally powerful spawn, unchained from their source, an individual capable of hosting an arbiter or simply whatever we were capable of becoming from the day the Eye showed up.