I would say that the only thing that you can be reasonably confident about is that the birds you photographed (two, or more?) are males, based on the amount of white in the wing (females of both species typically show a much narrower band). As others, including the eBird reviewer, have pointed out, effectively the two species are not certainly identifiable in the field without the aid of vocals (which is why we do not know where gundlachii winters). Nevertheless, to my eye minor typically does look rather bulkier and broader-winged than gundlachii, thus if I was absolutely forced to guess my instinct would be to call these birds minor, albeit with a strong caveat.
For the record, Common typically moves through Cuba in autumn after the bulk of Antillean have probably left (latest record of latter 9 Oct, but at least two weeks later in Common).
As for spring arrival, Antillean typically does not arrive in large numbers until April, but there are records from the Caymans and Hispaniola in March, and Cuba as early as February (well before Common starts to move through). I suspect that Antillean even nests on undisturbed roofs of tall flat-topped buildings in downtown La Habana, given that one hears them singing from such sites in early May (but out in the sticks, I have found nests with eggs already by fourth week of April). There are also winter claims from both Dominican Republic (December) and Cuba (January); the latter was heard by an observer with ample experience of both species.
