Yes, it would whisk small stuff around, and affect the orbits of Kuiper belt bodies just like the hypothetical Planet Nine is theorized to do. It would give a b

Yes, it would whisk small stuff around, and affect the orbits of Kuiper belt bodies just like the hypothetical Planet Nine is theorized to do. It would give a big kick to any objects that happened to pass very close by, but such encounters would be extremely rare. I don’t think the density of tiny stuff is enough for an accretion disc to form around it, but could be wrong. If one did form, we would probably detect its radiation signature.