Teach was always gonna be some sort of mutant given his weird constitution but not gonna lie I'm surprised he's been revealed to be a Buccaneer. Always felt like if anyone was revealed to be one, it'd be the original Nika or something so this link to the Davy Clan is interesting. More Buccaneer lore also means more info on PoL so I'm game for that.
Anyways on this Teach/Buccaneer thing though, there are stack difference btw Kuma and Rocks/Teach like I'm sure has already been pointed out in this thread. For one there is a significant difference in size btw Kuma and Teach for instance. Moreover Kuma doesn't seem to have the weird sleeping constitution that Teach does. So Kuma and Teach/Rocks are probably fundamentally different types of Bucaneers.
Maybe kinda like we have the Ancient Giants and the Giants we have different breeds of Buccaneers.
For instance let's say the Buccaneers are a mixed breed of Giants and something else, would a Buccaneer born from a regular giant be the same as a Buccaneer born from an Ancient Giant?
I get the feeling that whatever Loki is or maybe whatever Loki's mom's family is could potentially link to this Buccaneer lore