OBJ is a complicated dude. I don't think some teams are gonna work for a guy like him. He's probably got a few viable options in terms of the teams that do work for him, but with the others he doesn't know for sure they're a fit. Rams are for sure a fit. Reason he hasn't signed though is that he knows what Robinson added means and he's already gotta contend with Kupp.
But if OBJ is smart he will sign with the Rams. Because the Rams will use him carefully. They will get the ball to him in big moments. They will get him in big games. They will keep his name in lights and after his one year prove-it deal he signs a big deal elsewhere and does whatever he wants. Bottom line is he doesn't have time here to mess around. So go with the sure thing, keep the deal short, and cash in after the season and maybe getting a second ring.