Rhodey was at MIT with Tony *and* he's a pilot, which would make it easy for them to write in an acquaintance with Monica. Plus, he's cool and the MCU needs more of him.

Also, omg, the thought of Fassbender's Magneto running full tilt into the MCU is entirely too much fun.

We speculated a little that Wanda could maybe even be using Vision's powers b/c the clothes aren't an illusion but a molecular rearrangement of existing matter, which is more his jam than hers, but either way, she's doing a LOT.