Yeah I don't find the disposal of the bodies the most telling aspect of the case.
But his porch interviews, where he looks week rested and happy -smiling, no signs he had been up all night or crying- well groomed, clean, neat clothes, (so he was able to take a shower, carefully shave and put on clean clothes), no bags under his eyes, no red eyes, no shaking, frowning, grimacing, no crying during the three interviews, laughs a bit, grins, shows off his shirt when asked about it - that's the stuff that gets me.
Because he did all that about 24 hours after he supposedly saw his wife murder his kids. He looked like that and acted like that when he knew his children were dead and knew where their bodies were.
That coupled with his improbable behavior in actively working to conceal the murders from the get go and for at least 36 hours after, and no efforts to save his kids, call 911, try to get them to breathe, not one sound of screaming or crying or wailing in house (that's one helluva silent Greek tragedy that happened in his house), that his super close neighbors could hear, that's all the stuff that much more stunning to me and powerful to me than where he disposed of their bodies or how.