Critical-type unitarizability and Arthur-packet conjecture

Let $\pi$ be an irreducible representation of a split classical group and suppose that $\pi$ is of critical type, meaning that it is an irreducible subquotient of a representation satisfying the critical-type conditions on the inducing data. Critical-type Arthur-packet conjecture. If $\pi$ is unitarizable, then $\pi$ belongs to some Arthur packet. This extends the verified low-corank pattern to all unitarizable irreducible representations of critical type; the general assertion remains open.