The final Morisco rebellion plan hinged on Moroccan aid that could never arrive.

Evidence

There was just one further attempt made by Spain’s Muslims to save their homeland. There never was any real chance that it might succeed, for it was predicated upon large-scale assistance being provided by the Moroccan sultan Muley Zaydan, and this appeal was made at a time when he was embroiled in the bitter internecine warfare that weakened the Magrib. We may not think that this final d´emarche posed any serious threat to Spain. Given the state of internal Moroccan politics, there was absolutely no hope that the peninsula could be invaded, as seems to have been the plan. The important point is, however, that this last conspiracy was taken very seriously by Philip III himself. — L. P. Harvey, Muslims in Spain, 1500 to 1614, 1409