No no no, think of the circumstances of each person's disappearance.
TB set out on a test drive. How long does that take? Overnight? Days? No, SB gave him one hour and then called LE. LE immediately called the circumstances suspicious: At the May 8 presser, they said:
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OTOH, LE knew of LB from the incident with DA in mid March. Cocaine, ecstacy, pot, booze, shoplifting, assault, online sex trysts, prostitution, sleeping in parks. LE can't force anyone to do rehab. Often, the more people force someone to clean up, the more ties they break, until they sever ties with everyone they used to know in their sober life. The individual has to realize that this is a bad life and elect to seek rehab for themselves. From LE's perspective, LB was making the common descent into drugs, and as an adult, there was nothing they could do for her.
If LB had been able to make contact with social services, there might have been some help for her. But shelters have early curfews and demand that you don't bring in drugs or alcohol. LB found the park more appealing. Welfare will accept addiction as a disability and give you $1k a month towards food, shelter and drugs. However, you have to admit you are an addict, and the system will try and encourage you towards rehab if you admit that's what brought you to it.
It is not LE's job to be social services. They don't rehab people. Being an addict is not illegal. And that's what seems to have happened here: LB became an addict and dropped off the grid.
So when did LB become missing? Within an hour? The next morning? No, it was almost 2 weeks before anyone was concerned enough to call police.
Within 1 hour, SB was absolutely certain something had gone terribly wrong.
After about 2 weeks, SL asked LE to find LB, still assuming that she was still alive.
That is why TB's case gained immediate, massive attention, and LB's case remained a vague mystery.