That's kind of great. I can't recall what NotGrundy's real name was, but perhaps the killer really IS (or was) after her, and also her "boyfriends", not from his point of view seeing them as her victims. Did we see her latest actually get home safely? It could also explain the difference in method. The way he killed NotGrundy was personal, and the attack on Archie (if that's what it in fact was) was less so.
They DID say they would try to incorporate the "diverse" characters into the storylines this season, and this was only the opening episode. Give them a chance. They are working with Reggie 2.0, so that is a challenge already, the source material only has one black 'cat, and TPTB probably consider Kevin an example of diversity in his own right, and many of us were not easily incorporated into past soaps, as we generally do not work in the mixing up the couples formula. Besides, if they can do a spin-off for Sabrina, no reason not to look into a spin-off for Josie and the 'Cats, just as in the comics.