The primary disqualifying criteria for these things that are apparently everywhere on the outer solar system (and one of which we know to be larger than Pluto), is that it must be able to clear its orbit of objects.
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Which is an arbitrary test, that most planetary scientists disagree with. Pluto was downgraded by a very sneaky process that would make the crooks in DC jealous.
Oh please, it had to happen. Or we’re going to end up with a hundred planets once we get the Kuiper Belt properly mapped.