i second that.
@fruitnut 's bigger specimen is more developed than our noirs when our noirs finally managed to nurse the berries to maturity. Full sun this year will definitely help impart a sense of surplus on the rootstoc, as well as hasten ‘seasoning’ of the graft’s stems and future buds. The plumper the buds, the more likely for the berries to mature.
With nigras at dormancy, the buds that are actually thicker than the stems(they are borne on) the more promising the future berries within those buds.
glad that @chriso has the same guarded optimism and sentiments, and can’t add much more to the superb dissertation he just posted!
evidently the last resort !