Doesn't look optimistic. Was calling their us line since calling into saudi arabia since doesn't work (interrupted all the time after few seconds) and Mohammed told me:
1. you'll have to collect the luggage and re-check it.
Then I told him that the luggage belt is behind the immigration, so no access without a visa.
2. he switched to: you can't travel at all and need to cancel those two reservations and book the new one. But there's no availability.
After I asked him three times if I can use these tickets with no luggage and he told me three times no and three times was not able to tell me why, I realised he probably doesn't understand english, despite telling me he's in LA office. Finally he gave me a (saudi=impossible to call there) number to the airport, as if the airport was deciding if you can check it through. No surprise after reading all the reviews of saudia, but still dunno what to expect and as I'm arriving in DWC, can't ask the DXB check in staff in advance. Adventure. Hope it's gonna be fine at least with no luggage:-)