I never did see an answer to the 'co-terminal' question, so forgive me if this is a duplicate.

Q: Is there a specific definition in the OWE rules of "point of origin"?

I can't find one anywhere and it seems it is a key point for determining if some routings are valid.

E.g. SFO-LHR-SIN-LAX-SJC-AUS-SJC,(SFO). By my reading of the rules, this is valid. It passes the OWE Itin Planner as valid - so it should be OK.
Of course, the OWE Itin Planner also currently allows 20 segments, so I don't know how much faith to put in its results for post June planning.

mt