I am hoping that if he is guilty, that the crime is not premeditated. That would potentially mean that more mistakes were made, and there were certain things that could not be erased.
As you say, perhaps a huge argument happened and he got very angry. Perhaps the initial crime was domestic violence, which he decided to cover up by murder.
Whether premeditated or not, I'm feeling that he has an indisputable alibi for his movements on Mother's Day. I speculate that LE is busy filling in his timeline for the two days prior. I also think he was very surprised that LE did not buy the Mother's Day bike ride story. Moo
BBM:
Agree with the entire contents of the above post.
Focusing specifically on the bolded point:
BM appears to be quite anxious about that bike, doesn't he?
First, there's "family spokesperson" TN coming out and saying that the bike had been found, the fact that LE hadn't made that info public, notwithstanding.
Next, we have "family spokesperson" TN exhorting the public on the FB page to "Ask the sheriff about the condition of the bike!" or however he worded that missive.
Finally, we see/hear BM on video showing TD the spot where her bike was allegedly found, what position it was in when found, and complaining that "10 people touched the bike," that the Sheriff's Department "had screwed everything up," "they shouldn't have touched it," "should have left it," etc.
The bike was a staged prop.
Someone intended for LE to latch onto that bike, and chase it all the way down the labyrinthine rabbit hole.
Clearly, something stopped LE from following that script.
Based on all of the above, I'd say there's every indication that the fact LE's maintained radio silence about the bike definitely has BM rattled.
JMO.