Previous Post I think it was designed to serve multiple purposes. One was to give Stark a living family to interact with, a Mycroft Holmes and an Aunt May. One was to give Stark a source of angst and doubt, in that now he had no lineage of greatness, and therefore had to prove himself worthy of the Stark name. And one reason was, yes, to set up Iron Man 2020, an Iron Man 2020 who would have a greater claim to the Stark name than himself.

And yet he still hasn't apparently done a DNA test...

Also in that one shot im2020 tony is old and Arno is young, while in this current time they appear to be close to the same age

Really hoping they reveal that Arno is some type of temporal anachronism, perhaps caused by when Franklin restored tony after crossing/reborn/return, and that Arno is perhaps a copy of evil tony from the crossing.

Or else that this Arno comes from an alternative time line and with the aid of future tech and th controller he brain twisted Howard and Maria Stark and programmed them with fake story about tony and then make a replica of the recorder or reprogrammed the recorder and made that giant armor with the intent to fail to keep tony distracted