Excellent post, Chili!
Further, in each of the other cases mentioned, the husband was either at the crime scene and part of the crime (MacDonald) or was the last known person to be with the victim (S Peterson). MacDonald's account of the crime simply didn't match the physical evidence at the scene. Peterson placed himself at the very bay 100 mi away where his wife's body was found 4 months later. Those cases are not remotely similar either to each other or to the Bordeaux case, outside of each perp being male who was married to the victim.
Here we have an estranged husband who lives 3 states away and was not known to be either in the area or with the victim. No information has yet emerged which indicates the husband was either in the vicinity of FBs or KBs apartment, let alone in the state of NC, but never mind that, he is imagined as lurking in the area, and he seems suspicious.
Or, in the unluckiest coincidence ever, Kelli leaves the vehicle of a homeless RSO, within maybe 200 yards of her apartment, and is somehow confronted by an attacker who must have been watching her and was hunting her down. No one hears anything, sees anything, but the guy obviously has some ninja skills and a vehicle handy. Not even the RSO who was watching KB leave his vehicle saw anything. But it could be a random attacker because there have been other rapes in the area and even though their cases are different from Kelli's and none of the other victims are missing, attackers probably change their M.O.
Yet, for some reason, a guy, coincidentally a homeless RSO who KB only knew for a week or two, who was known to have asked KB about her marital status and showed some interest in KB and was known to be with the victim and was likely the last person who ever saw her alive, is not seen as the probable suspect because it doesn't "feel" right. And even though LE has publicly stated they believe the person who was known to be with Kelli has more information he's not telling, well, what do they know, they're fallible and probably wrong.
I'm with logical Chili on this one.