Yeah but it's not enough. If the allies have to fight their way into Spain (not hard, tbh, considering the state of the country) they'd then have to face a defended Pyrenees from the french side, with no spanish support. At the end of a long logistics chain, in unfriendly territory. You need a friendly Spain.Salazar could be brought off. Just promise after the war no interference with his oversees provinces, forever. The estate nuevo survived nearly years more iOTL