I TOTALLY agree with you!
I think part of what makes sociopaths such good liars is that they weave parts of truths into their lies so that even *they* can have convictions in their own lies.
Having said that, I now 100% believe Jodi pulled a gun on him in the shower and tha last pose of him sitting down with that awful look on his face is her holding a gun on him while she is taunting him and taking his "pre-death" photo. I think just like the ninja story she told, that the gun actually did jam, and that he did actually come out of the shower and tried to disarm her out of REAL self defense. I think the pic of the camera dropping is her dropping the camera to free her hands and get the knife.
I think she tells parts of the truth when she very emphatic but NOT arrogant in her answers, and the way she emphasized that he body slammed her -absent of arrogance- seems to jive. She then grabbed the knife stabs him repeatedly , including the heart, which disables him and is the mortal wound. But she doesn't know that for sure, and by now she's probably freaked that the gun didn't go off so she shoots it into him anyway just to make sure he's dead and to see what the hell is wrong with the gun. Then at that point the rest is history. I do think parts of what she is saying are pieces of the truth - especially the ninja story- just maybe in slightly different order. Keep in mind, it was the female ninja who had the gun that jammed and was then body slammed (by Jodi). I think symbolically Jodi was actually describing what really happened with her(as the female ninja) and Travis(who tried to disarms her).