As for Portaluppi I have developed my own theory. Twist of fate, his hometown – Acisate, in the Varese Province, Northwestern Lombardy – is not far from where I live, since I too live in this Province. Unfortunately, I haven’t found any detailed account of his survival; some years ago – for the 100th anniversary, for example – some newspaper published something about his story, which is veeeery far-fetched. The story was more or less that he jumped into the sea, swam for some hours, and then came upon a lifeboat which had Madeleine Astor on board; a sailor tried to keep him back with an oar, but he (Portaluppi) and Mrs. Astor had previously secretly fallen in love, and Mrs. Astor persuaded the sailor to allow Portaluppi to get on board. Now, this is a greeeatly embellished story, but let’s take just a point from it: rescued by a lifeboat which had Mrs. Astor on board, so Boat 4. We know that Boat 4 really came back and plucked several people from the sea; most of them are known by name: Frederick William Scott (fell into the water while climbing some falls down to Boat 4 while it passed alongside the ship, and was recovered by the boat); Samuel Ernest Hemming (climbed down No. 16’s falls – likely just before the final plunge began – and swam for ca. 200 yards to Boat 4, which he had spotted); and Frank George Prentice, Andrew Cunningham, Sidney Conrad Siebert, Thomas Patrick Dillon, Alfred White and William Henry Lyons, all plucked from the sea when Boat 4 came back (Siebert and Lyons died respectively on the boat and on the
Carpathia). But besides Prentice, Cunningham, Siebert, Dillon, White and Lyons, there was at least another, unidentified, man who was picked up when Boat 4 came back. Samuel Ernest Hemming gave us some sort of description of this man:
Mr. HEMMING.
After the ship had gone we pulled back and picked up seven.
Senator SMITH.
Who were they?
(...)
Mr. HEMMING.
Stewards, firemen, seamen, and one or two men, passengers; I could not say exactly which they were; anyway, I know there were seven altogether.
Senator SMITH.
Name what you can of them.
(...)
Senator SMITH.
Do you know who these passengers were?
Mr. HEMMING.
I know one was a third class passenger.
Senator SMITH.
What was his name?
Mr. HEMMING.
I do not know, sir.
Senator SMITH.
Where was he from?
Mr. HEMMING.
That I could not tell you, sir.
Senator SMITH.
Was he an Englishman or an American?
Mr. HEMMING.
I spoke to him, and I do not think he was an Englishman.
Senator SMITH.
Do you think he was an American?
Mr. HEMMING.
He spoke very good English, but I have an idea that he was a foreigner of some sort.
Senator SMITH.
You picked these seven men out of the water?
Mr. HEMMING.
Yes, sir.
According to Hemming, the unknown man rescued by Boat 4 was a third class passenger, foreigner (not English), who however spoke very good English. Now, Portaluppi was a second class passenger, not third; but maybe Hemming had guessed his class by his clothing/appearance. What interests me is that the description of this man as a foreigner who spoke good English. Portaluppi was Italian, so he surely would have been a foreigner for Hemming; but he had been living in the USA (in Milford) since years (he was on the Titanic because he was coming back to the USA after a voyage to Italy to visit his hometown), so he probably would have been speaking good English. This makes me think that the unidentified man picked up by Boat 4 could have been Portaluppi, and that Boat 14 rescued somebody else.
But it is just a theory.