Jenna is not the true rout, all routs are canon due to multiple universes existing.
It's the least shit route, though. Arches should hopefully take place in this timeline.
True, the 2nd best I think would be leo route with certain choices
I would've thought Arches would follow Flynn's or TJ's routes, since the main arches characters appear in the endings for those two
The town goes to shit on all endings, so the 2 new main characters exist and visit Echo on all timelines.