Borders in the Middle East were quite fluid - and, to a certain extent, they still are. So, as the Ottoman Empire collapsed, could the Kuwaitis have ended up with control of the region around the Ghawar field? Putting them, no the Saudis, in control of one of the best oil fields in the entire world? And, if so, what might be different? Other than losing in their conflict with Kuwait around that time, the Saudis would likely be relatively unscathed - though perhaps the hit to their prestige alone might hinder them - and likely would still be in charge of Mecca and Medina.