...but Paranormal Activity 4's ending felt too similar to the third; it never really went anywhere original.

I wish they would have avoided the plot device of the film footage just re-appearing, that was weak

Wyatt/Hunter thing. So since Hunter is going by the name Robbie now, Hunter has to possess Wyatt in order to live again? Is that where they were going with this? Because that really confused me and Wikipedia was no help. I don't get why Wyatt was suddenly telling people his name was Hunter after the bathtub drowning incident, and why Hunter's spirit would be going around possessing people. I thought that according to these movies, demons were non-human entities and thus were the only ones who possessed people? So wouldn't it be TOBY who was possessing the boy? So why wasn't he telling people his name was Toby if he was possessed by Toby? Why call himself "Hunter"? Are they playing on the name since he's a "hunter" who will work for the coven and hunt other children for them now? And the stupidity of the parents takes the cake here. Your daughter gets locked in the garage with a running car, almost dies, and has to drive the car THROUGH the garage door to escape, and you just act like it's no big deal? At least Micah and Katie in the first movie were willing to TRY leaving the house to see if that would help. These dipshits don't even do that. They don't even CONSIDER doing that. The more I think about the movie, the less I like it.

Robbie is actually Katie's legitimate biological son and Wyatt is Hunter.

Were all the people at the end possessed too or were they just human participants? Was that suppose to be a big reveal about a demon legion? If so that might explain some of the above... it was all so quick, although scary hard to make sense of

Oh, the bathtub scene is later in the film after Wyatt wrote "Hunter" in his closet, but I noticed after the bathtub drowning is when Wyatt really starts to go around saying his name is Hunter, so I figured before the bathtub drowning, they were trying to influence him, but after the drowning is when he really started to claim "Hunter" as his identity.

That actually makes a bit more sense if Wyatt is really Hunter and he was adopted. I didn't think of that. I was distracted by the bathtub drowning thing, and I thought that must have been when Wyatt was possessed, but if he really was Hunter all along, maybe that's just when the demon really started influencing him, after he was drowned.

About the adoption...maybe the demon's plan is to infect babies with demonic influence and then have them adopted out to families who have no idea they are bringing a demon into their homes. Maybe that is how the coven will grow in power? Although if Wyatt was adopted all along, I don't understand why Alex reacted with shock when Wyatt started saying Robbie told him he was adopted too. If Wyatt had been adopted, Alex should know about that, don't you think? She was old enough to remember her brother being adopted. Also, Robbie says Wyatt is adopted like him, so it seemed to me that Robbie was another baby that was taken, not Katie's legitimate son.

Also, if Wyatt was really Hunter and just adopted out to another family, the whole thing still has a lot of problems, as far as demonic schemes go. It's not like Wyatt was taken when he was a tiny infant and some family could have passed him off as their legitimate biological son, he was over a year old when he was taken. That's quite a switch to try and make. Even if, like in "The Omen," their original child died and they decided to try and pass off the new baby as their own, that's much harder to do with a toddler than with a little baby.

My impression was that the horde of people at the end was similar to the "coven" at the end of part 3, just much larger with more people involved. Maybe these "Paranormal Activity" type possessions are really happening all over and we don't know it yet, and these people are the ones possessed by the demons in all those cases we haven't seen yet.