Point not missed...no extension required then...so not any issue.
Return sector depending on winds may require the 3rd man to remain legal, it's not new....this has been done for PER, west Africa and even PEK in winter time.
I see why JJ opted out of this, simple, the operating Capt on the day makes the decision as the accountable manager. If the relief guy is unhappy then file an ASR.
Ciao