This is perfect! It is tied more closely to the Aeon card than the Last Judgement card, but not as tied to the specific Thelmic Aeons, and instead more widely applicable as the dance of Shiva, of which the Aeon’s would be a form.
https://en.wikipedia.org/wiki/Tandava
With its position on the tree, perhaps it should be constrained to specific manifestations of eternal energy, like Sthiti. Sthiti aligns well with the Judgement card, but also with the Aeon cycles. https://en.wikipedia.org/wiki/Sthiti
No cyclical aspect. Tied to personal responsibility and agency but not to the interpersonal dance of Shiva.
While "synthesis" may be the way a decision is made, the Aeon card in particular, and the idea of "final judgement", speak more to a decision than to synthesis, though the idea of synthesis is present.
The power that agency gives us to make decisions ties it directly to sense-making, which may use means such as synthesis to apply to sense-making (without Fiction?) Synthesis can be somewhat revelatory and lead to decision with little Fiction involved, though synthesis may also be involved in a Fiction process of sense-making.
Agency gives us the power to make decisions, regardless of how we arrived there, which does seem to be a shortcut to sense-making. Sometimes the decision can come before the speculating. It's a different path toward making sense of something. I think it speaks a lot to the revelations that can come to us instantaneously and result in a decision without much contemplation. It really is the only way to bypass Fiction in the process. Fiction seems the only conscious path to sense-making, while a Decision can be based on a subconscious insight with the same effect, even if further refinement is made in the sense-making process.
It seems even more clear to think of decisions being made based purely on either Sovereignty or Narcissism. Both "I just made a decision because I'm the decider" and "I just made a decision because my opinion is the only one that matters" ring true.
It also makes sense that this decision can be before or after other sense-making. It could be that after a great amount of sense-making, a final decision could be ungrounded apart from what ones gut says in the end.
A decision is a collapsing of the Fiction wave function, so to speak. We're past improvising based on Fiction born of our experience; We've decided and are on to either being disillusioned or vindicated for listening to our genius.