  The case for a dibaryon resonance, appearing in np scattering, has support
from a WASA-at-COSY measurement of the polarization quantity A_y over a
center-of-mass energy region suggested by structures seen earlier in two-pion
production experiments. Here we compare fits with and without an associated
pole in order to clarify the impact of these COSY data. We then consider what
further np scattering measurements would most clearly distinguish between the
pole and non-pole fit results.
