He didn't really do much this season and I thought it was kinda random that he was the one to have all of those wires in him. And why wasn't it explained? (Or was it and I really missed that scene? XD)

Corey is always a random and completely unimportant character to most of the story and characters, but he actually had a much better character and story in 6x02, but that was one episode and that's all I remember, and it was pretty much the same last season, he had one or two episodes where he was interesting and did things but the rest of the time he didn't appear at all or he just didn't do anything.

I've heard a lot of people joke about when Douglas made him disappear "Well Corey disappeared which was pretty much the state he was in every episode" and sadly it's true, Teen Wolf haven't done that good of a job developing Corey or Hayden, but it almost seem like they want us to care about them a lot and even seem to think that we do as well. They need a lot more development as characters if that is to happen and much less time with repetitive kissing scenes

He's a pointless and super cheesy character who serves no purpose, so there's nothing to be disappointed about for me.