the caller says “35 yr old Air Force colonel” Rhodes is not 35 at the time of Civil War (he is older) and he is also a lieutenant colonel. Additionally, if it was him…the guy would have presented the case as “War Machine from the Avengers was injured in the line of duty” Assuming that it is Civil War the Iron Man armor is far from experimental at this point.
Like I said above, Feige has openly stated it wasn’t connected to anyone in particular, just a fun description to make people say “hmm”, but no more. I enjoy the speculation as much as anyone else…but it doesn’t make sense that it is War Machine from Civil War in the way it was so casually spoken about.