Right, so I have been giving this some thought and I think I have this game figured out.
To me it seems pretty clear that Max's powers are derived from the native american spirits as the game keeps on dropping bread crumbs, hinting about how Arcadia Bay has had a rich heritage in regards to the native tribes that once occupied the land. Furthermore there are repeated uses of animal symbolism that are consistent with the local Siletz and Tillamook personifications, such as a deer being genital/graceful, filled with determination; a perfect description of Max. I also think Rachel Amber had the same power, prior to Max. The game notes many similarities, such as how Rachel always seemed to know what to say and navigate her way around things. It is even hinted at that her and Max are very similar, both in terms of physical appearance, but also sharing the same spirit animal. What likely happened is that we know Jefferson is up to no good, and that the Prescotts have been raping and pillaging the land for several generations. The native american spirits through extension of Rachel Amber and Max are attempting to change the course of Arcadia Bay for the better. Because the spirits are dead they have no tether in the material world and need an anchor, that is why there are totems like the Tobanga, further more through people like Max and Rachel they can have a greater impact as both are more connected with the present Arcadia Bay and in theory reserving better judgment for when to use their powers and when to help. Going back to the deer symbolism, its attributes are calmness and patience; knowing when to haven empathy and step in. The spirits chose Rachel and Max for their personalities and ability to help as we know the side effects of are all sorts of disasters and freak phenomenon; the examples being the snowfall, double moons, and tornado, also physical trauma to the individual, like Max's nose bleeds. The indian spirits know the importance of limiting the use of said powers and that is why they chose two individuals with the attribubtes of a deer. Problem is though that humans are corruptible and Rachel eventually used her power to better herself and not for the selfless benefit of Arcadia Bay. That is why the Prescotts & Mr. Jefferson are building pan estates, so that when the storm comes they will be ready and can rebuild the town the way they want, that is why him and Nathan are doing this sick photography stuff to those girls is because when they rebuild, they need good breeding stock. But what they don't expect is Samuel, he talks about also being in touch with the spirits and especially the squirrels. He talks about feeding them and how they are always hungry for flesh. Samuel plans on summoning the storm to wipe out Arcadia Bay so that the Squirrel King and feast on all the corpses. But the worst part is that Warren is actually Hitler, who traveled into the future in order to romance hipster-art nerds like Max. Think about the similarietes, Hitler loved art and Warren has all these arts-y films on his flash drive. Furthermore the prescots mailed a letter in 1912, the same year Hitler joined the german army in WWI. The coincidences are just tooooo real. Max must travelback in time to kill Warren/Hitler. It makes sense.