North African Muslims already outnumbered Spain’s defenders by themselves

Evidence

It is no valid objection to say that if [the Moriscos] go to Barbary they will join up with the Muslims there, and descend on Spain, because in any case there are more than enough people [to do that] in North Africa already. They do not refrain from attacking for lack of numbers, but because, as is well known, they are in fear of Your Majesty’s forces. — L. P. Harvey, Muslims in Spain, 1500 to 1614, 1364