The Trios’ lines in the TRoS trailer are clearly meant to tell us what their arc, their character’s focus, will be in the movie.
We hear first from Finn, the Poe and finally Rey, words that are meant to tell us how this is going to go.
Poe’s and Rey’s are by far the most clear cut.
Poe’s words about leading and those who wishes to fight will follow them, clearly is a continuation of his position and arc from the last two movies and the comics as the new leader of the Resistance.
Rey says that people always say they know her but no one does, telling us that her arc about identity and finding out who she is, is not at an end. Secondly it might herald a possible opening to the Dark side for in a rebelling against a role who has been foisted on her, but she never wanted. Unlike Anakin and Luke she never wanted to save the galaxy or have much in the way of adventure, she wanted her family. But now she designated galactic savior and she may be quietly revolting against it. Kylo’s appearance at the end and his claim that he does know her feels like a mallet heavy hint at her being a Skywalker or a Solo (and Kylo possibly being involved in her original disappearance).
Finally there’s Finn, whose words seem mysterious as to his role. And then again not.
The trailer starts out with him saying “It’s an instinct. A feeling,” and it sounds like he’s describing the Force without Jedi dogma or indoctrination. His voice is soft, like he’s trying to put into words something he doesn’t quite have words for.
Then it continues, “The Force have brought us together”.
His voice is still soft but there’s more firmness and far more conviction here. It sounds to me like it comes from a different place in the movie than the first part and almost like he’s giving a speech. Either way he speaks with the conviction of a Jedi but without the arrogance of one.
And here is what I think this tells us about Finn’s part in this movie.
At the end of the day what brought down the PT era Jedi were their arrogance, their certainty that they alone were right and them putting systems, institutions and dogma above the needs of living people. This isn’t something TLJ invented, we have two trilogies and I don’t know how much extra material telling us as much already.
If the Jedi are to come back and be a constructive part of the galaxy they need a different path than what the PT era Jedi walked (and what might be written in the sacred texts). They need someone who puts compassion and humanity above institutions and systems and dogma, someone who will rebel against it and tear it all down if necessary.
In short, the future Jedi if there’s to be a future for the Jedi at all, need Finn.
He’s a man with no Jedi training and hence no dogma induced in him, but that doesn’t mean he doesn’t know the Force and the trailer tells us that indeed he does. He has shown already that he will question and outright rebel against any system he finds wrong, no matter how dangerous it is.
Rey would never be able to bring back the Jedi alone and with only the old texts and what little Luke gave her, there’s far to great a chance that she would repeat the mistakes that the PT Jedi and then Luke in turn, made. And it’s a job she doesn’t really want to have anyway.
But with Finn’s humanity, compassion and his complete lack of reverence for authority and institutions it might succeed. His traits are the key missing to unlocking a better future for the galaxy and a possible future a Jedi Order who is doing what it was supposed to be doing all along, protecting the people and all living things in the galaxy from dangers. Especially when those dangers comes from their rulers.
