They don't need any of that. That's why I said MCU version of Shadowland. An adaptation of the comic storyline to fit the continuity of the MCU, just like with Civil War.
And there's no way Loki or Extremis are coming to the Defenders. This is a street level team, meaning they address those type of threats. Not things the Avengers or SHIELD deal with.
Civil War in the comics was about secret identities, and yet its not about that in the movies. The same can be done for Shadowland.
And dude, it painfully obvious they're setting up for Shadowland:
-Nobu is strongly hinted at being part of the Hand (not to mention his name is similar to Hand member Kagenobu Yoshioka, which I wouldn't be surprised to find out that Marvel shortened it to prevent people from figuring it out )
-Stick mentions an upcoming war to Stone. Clearly setting up the Chaste's conflict with the Hand
-Black Sky is key here. Black Sky was shown as a young boy whom Nobu has shipped to HK. He was deemed him as a weapon of sorts. We saw that the boy was chained to the inside of the crate. Judging from the eerie supernatural vibe the child gave off; I’ve surmised that he had demonic connections. “Shadowland” deals with not only Matt controlling The Hand, but also being possessed by the demonic Beast of The Hand. This ties into if Murdock will “be ready when the gate opens”, due to the fact that the gates are probably opening for The Beast. (Not to mention Nobu tells Fisk another Black Sky is hard to get, and Stick mentions that Black Sky is not just a mere child).
-In “Shadowland”, The Hand schemes include seizing a part of the Hells’ Kitchen. In season one of Daredevil, Nobu can be seen discussing the control of numerous properties and land with Wilson Fisk. One of the blueprints include:
The words on the map translate to Black Sky. Just like in the comics, the Hand are seeking land in New York.
-The Hand is a ninja order who have dark connections and seek to spread their darkness across the world. Having a black sky is the cause of darkness.
Now, looking to the future (how do the upcoming series feed into Shadowland):
Marvel is keeping things small with the Defenders in terms of the area they use. It seems more likely each day that they are taking Luke Cage out of Harlem and relocating him to Hell's Kitchen. Elektra is being introduced and she has ties to the Hand. Iron Fist is all about Chinese martial arts, but I am sure the K'un-L'un will have an awareness about the Hand. Colleen Wing has ties to the Hand as her own mother was part of the Hand subgroup of female warriors called the Nail. Her father Lee Wing is a professor of oriental studies, so he should have some slight knowledge of a shadowy ninja organization. And lastly, Shadowland was the big street-level event. It will take Daredevil, Jessica Jones, Luke Cage and Iron Fist to team up to take on the Hand as well as help from their allies like Punisher, Elektra, and hopefully Misty Knight and Colleen Wing.