The motif of the multiple Federicos occurs in prose texts (letters and prologues) not in poems and plays. These are more likely to be texts in which the poet declares an intention.
It indicates a pluralistic sense for the creative self, the generator of poems and plays.
Also for the personal self, the biographical subject.
We can see it in Lorca's own thought.
And we can read apply it to our own reception of Lorca.