Isn't the appeal of a Defenders story though being about focusing on street level heroes instead of ones with big time powers? I mean some would have some powers but Hulk and Dr Strange seem overpowered for such a show.
Dr. Strange, Namor and Hulk were the original Defenders with Silver Surfer joining a little later. Street Level Defenders (which would have been a good name) were the Heroes for Hire/Power Man and Iron Fist--although "street level" in the comic book sense.