Slightly different question, but couldn't find the right thread for this on mobile search.

I am looking at booking ORD-SFO-YVR/YVR-SEA-ORD shortly. All segments except YVR-SEA (AC) on the return are UA metal. Does most significant carrier rule apply on the AC segment, allowing all 4 passengers on the itinerary the usual UA Gold checked baggage allowance? I would think so, but also have heard some difficulties with certain gate agents. We would likely be checking skis and a snowboard and AC only allows one checked bag for *G. Thanks.