Outcast's strongest element is definitely the exorcisms. Character interplay needs improvement in my honest opinion. Here's what we know about Outcast: 
 1. Being an Outcast is hereditary. Hence as Sidney pointed out, there are more than one of them. 
 2. Outcasts are essential in the Merge. But why Kyle is the one being "chosen" out of many, that we still don't know. 
 3. We still don't know a f*cking thing about this Merge except that it is an important demonic event. 
 4. Megan hates her mother and Donnie (whose plot is still hanging, except for the fact that we knew that he raped her). I personally personally want to keep plot points resolved first than introducing new characters. 
 5. The pentagram mark is still there. Still nothing special. The reverend seemed undeterred from the demon's threats. 
 6. These demons are weak against light, water and loud noise. Not the power of god. 
 Don't get me wrong though. I like reading Outcast. But the story progresses like a turtle on a downer and it feels like it has been going in circles. The mystery now feels like bland vagueness.