What doesn't make sense about the finale (spoilers obviously)?

There are things the show have not revealed to the audience yet.

maybe her "powers" hadn't activated yet?

Kyle was also abused and strangled by his possessed mother. Maybe it's not something that's always active, but has to be awakened or figured out.

The volume on my computer was being weird. Does anyone know what the Chief's wife said about that red head kid taking Kyle's daughter? I was honestly flabbergasted, did he just walk into the house and take the girl? And the wife did nothing to stop him? What!?!?

This post contains some spoilers. If you have not seen the entire first season I suggest you stop reading now.

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It seems that Kyle has been the host body for "an entity" since childhood, meaning his entity would've been present when his daughter was conceived. The traits and characteristics of his "entity" seem to have been passed on to his daughter, Amber... much the same way hair color, eye color, etc. can be passed on to children from their biological parents.

[To clarify, I refer to “the black substance” as "an entity" because I'm not sure what it is yet. At first I believed it to be the form of a demonic being, but NOW I'm thinking it’s the form of a being from another dimension or, perhaps, an alien life form from another world. Moving on….]

Once these “entities” emerge and take control of their host bodies, everything is new to them. Light hurts their eyes because they are not used to it. Their human skin is itchy and irritating. They are intelligent, curious and fascinated about everything they encounter but they are also immature and primal. They act instinctively, reacting violently to anything and anyone that seems to be a threat. Essentially, they are very much like newborn infants experiencing the world for the first time...but their human hosts — even hosts that are young children — are larger than infants so whenever they feel threatened they can do much more than cry and shriek. They will either run away from the threat or they will attack it... the same "fight or flight" response that all living creatures are capable of. They don't kill for the sake of killing, they are motivated by self-preservation. They kill to survive. In time they eventually get used to their bodies and surroundings, and they “mellow out” enough for their instinctive violent reactions to subside. Once that happens they're able to live, unnoticed, in their human hosts.

In the finale Kyle asked Sidney where he and "the others" came from. Sidney replied, “From the same place you did” (or something like that, I don't remember the exact wording)... implying that Kyle is one of them. Kyle, himself, is the human host for an entity, but his entity is not the same as the others... and whatever that difference (or differences) are caused him to be “outcast”. He’s able to force entities out of their human hosts so he’s obviously more powerful than the others, but whether the others consider him a huge threat or their strongest ally (possibly even their leader) remains to be seen.

Where Amber is concerned, I DO NOT believe she is a host body for an entity. I believe she is a naturally-conceived “human-entity hybrid”... quite possibly the first of her kind. The differences between her genetic make-up and Kyle's is most likely the reason why entities can touch her (and vice-versa) without recoiling in pain. She could very well be more powerful than her father...but, again, this remains to be seen. When it comes to expelling entities from human hosts, I believe it requires "intent". Kyle and Amber can detect an entity's presence through touch alone (ie: a handshake)... but in order to expel it, they have to actively be trying to expel it.