Troll,
you've hit upon one of my pet peeves with all Tolkiendom these daze:
The outright 'running wild' with information & jumping to conclusions that the author himself never intended...
And then these 'experts' will go on saying that
Tolkien, as fine as stickler for detail as any author that ever lived, was fine with folks tearing apart his works & reinterpretting them. Whereas, when I read his Letters, he's basically going bonkers anytime somebody does just that!
So, back on topic, there's some debate as to when
Glorfindel arrived back in M-e.
(I think at this point we can all agree that it is one & the same Glorfindel returned from the dead, right?)
There are several notes, from 1967, I believe, among the last Tolkien wrote, about Glorfindel possibly returning in the middle of the
Second Age aboard a
Numenorean ship via the
Elves of Tol Eressea. This presents problems in & of itself as there's no mention of Glorfindel for another 3000 years, until facing off versus the
Witch-king in T.A. 1975...
Where was Glorfindel all that time? Wasn't he involved in the Last Alliance? There in the final battle on Mount Doom? Others of little or no more import are mentioned like
Thranduil &
Cirdan.....
Plus, the
Istari are, in published accounts, said to have all come at once around 1000 in
the Third Age.
So, the idea of Glorfindel & the two
Blue Wizards appearing in the middle of the Second Age on a Numenorean ship is not only an unlikely scenario, it would require editting the published TLOR.
So, it's out.
Glorfindel could've come alone, but it still requires special passage from the
Numenoreans (not a big deal) and 3000 years of silence, so I tend to rule it out.