Scott Lang was also in the extended FF, for that matter. And so was Moon Knight, who was tangentially referenced in the new movie.
Frankly, if Disney is going full on B-side shit with Guardians of the Galaxy and the Collector and so forth, I want them to do a Heroes for Hire movie. Fuck yes. The time is now for Heroes for Hire - because the first one could be the origins, meeting, initial fighting and then joining up of Iron Fist and Power Man, and then the sequel could be like fucking Mysterymen and bring in all those street-level heroes who have done work for Heroes for Hire over the years. The Daughters of the Dragon. The Prowler. Shang Chi. Black Knight. Darkhawk. Show Falcon getting some side gigs with them between working with Cap.