The police built the barricades around Raccoon.
The different scenarios such as Leon fighting Tyrant and Leon fighting G-Birkin.
UC isn't really a problem for me. The problem was that the RE theorists wanted to account for all sources as canon, and didn't like the idea of retcons. I personally wanted the retcons because I didn't like all the random offshoot bits of evidence that I couldn't personally collect.
The IW (SW, as you call it) is an independent event, like
LoZ's back story,
AoL's back story,
TWW's back story,
TMC's back story, etc. The Evil King Ganon was "born" when he took the Triforce during the IW, but this is a different incarnation of the character from
OoT, with different origins. I think within its own context, the word "born" is acceptable even if the character has appeared before.