I guess they're at it.
Anyway, IMHO the incident is absolutely possible. Bear in mind that i.e. the Sagas and other tales were always met with sceptism, and then they were manifested when they were backed up with archeological findings.
The Vikings were told to have been in Istanbul, - it was well established when runes were found scribbled inside mosques. (Halfdan var her).
Same goes with America, - Vínland. Ruins and other artifacts found.
Then there is Greenland and the mystery as well where the population went, - or did it die out. One theory is the Canaries, and actually there are suspicious ruins there....
In my surroundings, there is the scenery of our most famous saga, - Njáls-Saga. While almost considered as a novel, it seems to hold water, and all checks and excavations seem to support the tale. One artifact recovered from excavations on a historical site (battleground) is traced from the huns, - while the book mentions a weapon loot captured in a pirate vs pirate fight in the baltic!
Those guys were all over the place. Deep into Russia, down along the African coast, crossing the N-Atlantic, all over the Med, - and these are the things we know for sure.
So, Incas add quite something to it, and the whole issue of archeology perhaps has interesting news to come!!!!
