1) the "steps" would certainly be looked at by LE especially if they were involved in the death as I previously stated. For example the steps would be considered if, a broken neck, blunt force trauma, etc. was found, but not likely looked at closely if the mail man shot her, detonated her, and or ran her over with his vehicle.
2) On the loss of car keys, most people start looking where they had them last/seen them last. As one looks, evidence is found, ideas are formed, maybe a spouse's testimony helps one remember/leads one to find more evidence or the keys.
The police started looking where TB was seen last and apparently they found more and more evidence, a spouse's testimony, formed ideas based on evidence found, that lead them to the arrest of DM/MS.
Amazing how similar, logical, reasonable, and efficient those two events are.
The end result is highly conducive to finding one's keys, not someone else's keys......the correct keys.
IMO this must be why so many charges get dropped and cases discharged. dismissed or acquitted.
I do not see how the police have found more and more evidence.... you may be privy to more info than most...but maybe not or else why be sleuthin' would be a question I may ask....
The 'evidence' so far appears to be a body at a farm owned by DM and the truck found at his mothers driveway.
The spouses testimony can only relay that she saw two people come to her house and leave when her husband left. She did not see what happened after that or who was involved.....
There is a burner phone apparently but so far no one knows who bought it or owns it as it is a 'burner' (anonymous) phone. They say the burner phone led them to DM.... but we have no idea how...whether DM called from it, whether someone claiming to be DM called from it or whether TB texts it and mentions DM by name.... we have no clue....either way...still no proof who was using phone, who called from phone or whose phone it was/is.... IMO
I see nothing highly conducive or conclusive in any of this.... just a few what appear to be carefully laid pointers.....which when added to the unknown facts makes for a very difficult case to solve IMO