> It's legitimate, for example, to play through segments 1/2/3/4/5, then go back and redo segment 2, and then continue on from redone-segment-2 to an all new re

> It's legitimate, for example, to play through segments 1/2/3/4/5, then go back and redo segment 2, and then continue on from redone-segment-2 to an all new redone-segment-3, which has lost all pretense of existing in the same timeline as the original run did. Even then that could be pretty dubious, depending on the game - you'd need to demonstrate that your redone-segment-3 ended at a game state indistinguishable from the end of the original segment 3.