I don't know enough about "Rust", but that may be the problem in #3. #5 looks a lot like water stress, though not exactly. #1, #2, #4 may have Rust issues, as well, but also appear to have FMV issues, which is not uncommon on the first leaves of the season. It makes them curled and distorted, but later in the season usually only shows itself in colored patterns, and and much less distortion.