I think it would be very unlikely.
All the flights from Spain go to a UK crew base, so the crew from the UK bases fly those routes.
The only exception is BCN where they also fly to GVA, which also has a crew base.
Whenever we have started new routes starting in a different country, the UK bases have crewed those flights. Only after the routes have become established has easyJet set up a crew base. For example, the CDG-NCE flights were covered by London based crews.
Therefore I think it would be very unlikely that easyJet would set up a Spanish base.
All our efforts at the minute seem to be going into expanding in France, especially since all the ex-Buzz routes have been cut.