How does 2015 RR245 compare to the other KBOs predicting "Planet 9"?
It was the first thing I thought too, but I would say it won't count in the statistics.  The earlier paper by Batygin &amp; Brown was talking about bodies orbiting further out.

2015 RR245 orbits between 33.7 and 129 AU.  The "cluster" of bodies considered in the paper have aphelion distances from 150 AU upwards.  So I think it would be a mistake to try and fit this new body into the existing figures.