Fan Casting Iron Man in Andrew Garfield's Spider-Man in Avengers: Age of Ultron

Following Spider-Man's return after a five month absence, Tony Stark is inspired to come out of retirement and builds the Mark 43 so he can rejoin the Avengers while the Iron Legion are being developed. I thought it was stupid that they didn't explain what happened with Tony between Iron Man 3 and Age of Ultron because he seemingly retired at the end of the former, but was shown not to at the beginning of the latter, so I thought using Spider-Man's return could give him the idea to come back