per every source I can find: Retcon or Retroactive continuity (usually) means a deliberate action on part of the author to change facts in a story, usually to allow a given work to continue.
So by this logic in Bleech when they do the 100 years in the past thing unless they change any details that contradicts already given history its not a retcon. Its a flashback.
However if an item in the series say a Gigai is used in one way with certain effects given, then later given other properties then this is a retcon.
Although this leaves the problem open to a retcon again of fixing this to make both true and ultimately none a retcon.
I have noticed the same thing in other series before too that include time travel or extended flashbacks. what about others?
So by this logic in Bleech when they do the 100 years in the past thing unless they change any details that contradicts already given history its not a retcon. Its a flashback.
However if an item in the series say a Gigai is used in one way with certain effects given, then later given other properties then this is a retcon.
Although this leaves the problem open to a retcon again of fixing this to make both true and ultimately none a retcon.
I have noticed the same thing in other series before too that include time travel or extended flashbacks. what about others?