system
Given the following post, respond as if you're commenting on Reddit:
human
[The Defenders] Why don't Daredevil and Iron Fist train Jessica Jones and Luke Cage?

In The Defenders we have four superheros.  Two are incredibly skills martial artists with near human abilities (Iron Fist, maybe more than human.)  Two are incredibly powerful and durable but don't seem to know how to use their limbs.

Why don't Daredevil and Iron Fist train Luke and Jessica?  In the Netflix series, Luke and Jessica look like overpowered toddlers with no bodily control.  If they knew what they were doing, they'd be unstoppable.
gpt
Mostly, they don't have enough time.  
Outside of that though, Jessica wouldn't do it and Luke doesn't need it.  Martial arts make a lot of assumptions about the fighter, and one of them is that they can be hurt.  Luke really can't, and he knows how to exploit that better than anything DD or IF could teach him in any reasonable amount of time.