I'm pretty sure Quinn and Batista realised the "shadyness" with Dex and Saxon but they let him get away with it because of what Saxon did to Deb. But Dexter does get away with A LOT, especially in the later seasons when he gets sloppy because, you know, feelings. That to me is the most annoying thing as the series progresses, they could've made him "emotional" but still as methodic as he used to be
yeah batista wasnt really aware of dexters dark side (quinn kind of was) and it was more of an act for deb, not for the dark passenger. and all three of them cared about deb. i agree with you, things did get sloppier, and the writing was not as creative as it was in the earlier seasons.
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