So finally, Miguel has done the deed. But I don't know, I have (I'm sure as everyone) a feeling that Miguel will be killed by the end of the season. They may be the same (traumatic childhood experience leaves them thriving to kill) but Dexter grew up with guidance who realized Dexter's capability at a very young age and helped him curve that desire into a somewhat "moral" code. But Miguel is a newborn baby. And those are hard to control, as we can see when a dazed (maybe more like psychotic) looking Miguel enters Ellen's house to kill her (although the show only indicates that - I have a slight hunch she might be alive, at least long enough for the next episode. Only a slight one). I could tell Miguel doesn't agree with Dexter's code as he nonchalantly talks about it as if it's something in the way. What I see is that Miguel gets out of control with his urge to kill and Dexter is forced to kill him, like how he killed that pale Brittish girl from Season 2 (totally forgot her name lol). You can tell since he cuts corners as a DA - planting false evidence, missing evidence, etc. Dexter does not play like that. He has a stable mind and good reason/sense of justice. Also, you realize Harry is always "wrong" when he warns Dexter not to do so and so for Miguel, but I think it just foreshadows the climax where Harry was ultimately right in the end.
It's kind of sad though since Dexter is trying to break out of his shell. If it's not that predictable, I can't wait to see how this season is going to end. I do not know what to think about Quinn/Yuki situation...it's such a vague situation and deals with a lot of "he said, she said," it's to the point where I don't even care about that at the moment. And I love Deb. She is such an awesome character with her boisterous self. I wonder who the skinner is...is it really that King guy? I doubt it. I bet he's just the eyes and ears for the real killer. Anyways, hope it all ends with a happy ending, possibly like Dexter's wedding, Dexter's newborn baby, or something of that sort :]