Am Oneworld Sapphire, flying BA First into PVG, then an 8hr layover, then JL Business to HND. While I appreciate BA don't interline luggage, would JAL look favourably upon me as a Oneworld Sapphire *if* my preceding BA flight arrived very late for whatever reason into PVG?

Reason I ask is that my JL sector is a reward flight - so if I missed it, I could be scr*wed.