Here is a quote from pg. 220 of
this book.
“In many books about Fatima, the prayer Our Lady asked you [Sr. Lucia] to say after the decades of the Rosary is given in some such form as this: ‘O my Jesus, pardon our sins, save us from the fire of hell, have mercy on the souls in Purgatory, especially the most abandoned.’ Is this correct?”
“No, it is not,” she replied positively. "The correct form is the one I have written in my account of the apparition of July 13: ‘O my Jesus, pardon us, and save us from the fire of hell; draw all souls to heaven, especially those most in need.’"1
Footnote 1: “Ó meu Jesus, perdoai-nos e livrai nos do fogo do inferno; levai as alminhas todas para o Céu, principalmente aquelas que mais precisarem.”
Now, the above is referenced online in places like
this Wikipedia article, which incorrectly cites Walsh’s book — the *Image * books edition has no page 225 — and which, alas, cites a Sedevacantist website.
However, I found this quote in my own copy of the book, and provided the full context, which began with a question on Purgatory.
I bring all of this up, simply because I think it may be true that “alminhas todas” means “all little souls,” and that this is an idiomatic expression for the Holy Souls in Purgatory. “
Alminhas” also happen to be shrines that are set up for the Holy Souls, and, if “alminhas todas” means souls currently in Purgatory, this would also explain why some early versions of the Fatima prayer included an incorrect but explicit reference to Purgatory.
If this is true, then the answer to the OP’s question is simple: those “most in need” refer to those souls in Purgatory who require the most purification before entering heaven.