system
Given the following post, respond as if you're commenting on Reddit:
human
[Unbreakable] What is the most precise description of David Dunn's actual powers?

As well as potential weaknesses and logical vulnerabilities.
gpt
David Dunn didn't receive his powers in a lab accident so his powers don't necessarily have to be consistent. He was probably born with his condition, like Glass was, but how or why is never really explained.

We know that David is exceptionally strong and durable, but it's not clear whether he's *superhumanly* so. He can survive car accidents and train wrecks with barely a scratch but we don't know if it's because he's invulnerable, or if he's lucky as well as tough. The ESP thing is definitely supernatural but we don't know how it connects to the rest of his powers. 

Similarly, we don't know how his weakness to water really works. How much of it is psychological, and how much of it is because his body is unusually dense? Is this some kind of fated Achilles heel or could he take swimming lessons at the local YMCA?