1) Luke Cage
Seeing as Iron Fist will be the last series to air before The Defenders, there will surely be some hints as to the formation of the team will be given in the show.
The perfect way to introduce the idea of these separate heroes co-operating would be to feature Luke Cage in the series. Why? Because Iron Fist and Cage are best buds in the comics. In an attempt to cash in on the Kung Fu and Blaxploitation crazes of the 1970s, Marvel paired up Luke ‘Power Man’ Cage and Danny Rand in their own team-up series.
For those unfamiliar, the series them form Heroes For Hire, a sort of superhero detective agency. The duo have partnered up several times since then and have actually become one of Marvel’s longest-running superhero friendships.
Given that, it would be very surprising if Mike Coulter’s Cage did not turn up in Iron Fist, even if it was just in a small role which hinted at the greater partnership to come.