I rewatched and Stick does catch up with the Black Sky, however, I'm wondering exactly how that worked out. It seems likely that his more refined senses allowed him to trail the car across NYC rather than that he straight up caught up to it. However, when Matt gets to his flat, Stick's already there. It's possible that they simply drove near to Matt's, I don't think Hell's Kitchen is all that big.
It has a decent size population of 45,000+ people based on a quick google search, but yeah I also don't think it's very big in terms of area (around 0.841 sq mi or 2.18 sq km).
I'm not sure, I don't think we can really call that a speed feat though, too many possibilities.
I personally take it at face value. Being able to heal wounds faster than normal via meditation seems pretty far-fetched itself but it's apparently legit. Nobu is immortal to an extent (was also rumored to have lived 3 lifetimes) and Hand ninjas were brought back from the dead (Elektra herself is being prepped for that). Being able to turn back the hands of time and having the physicals to catch up to a getaway car, even within a small area, shouldn't be too out there considering everything else.
He even told Matt that meditation makes you "way stronger, more focused, and even heal your wounds faster."
Not sure, I feel like he should be more skilled than Matt, Steve and so on, but it's difficult to say. I hope we get a bit more from him in the Defenders.
Yeah, towards the end Selvig says that despite the mind control, he was cognizant to some degree and built in a safety to cut the power source.
Huh. Interesting. I guess Hawkeye could've been resisting but I was thinking that he couldn't based on his conversation with Natasha after their fight.