well for one we know that chronopolis appeared in bc... this was before the split...
when the split accored it caused the crono group to remain in only one of the two timelines while traveling foward or back on the time line. if you assume that the gates where only existent in the orignal timeline(homeworld branches off like the short line in the lowercase y while the orignal timeline, another world, remains straght)
with the timeline branched in two, the feature of another world(orignal) would be unchanged because crono group destroyed lovas. but sense the homeworld(new branch) was inaccessable to the crono group the future was not saved, resualting in the future structure, chronopolis to be non existant, the destroyed future was pulled back to fill the void left by the non existant chronopolis
hows this sounding so far?