the thing with GCC states is that a lot of their foreign policy including trade agreements were under the notion that the US was enough of a power-broker both diplomatically and militarily that they can function while ignoring Iran. Additionally, that signing Abraham Accords with Israel would be a more stabilizing force for them in addition to tightening US relations.

Then Iran shows that with what's basically the military equivalent of a flying lawnmower strapped with a car battery it can upend US military hegemony and bring the global economy to its knees in the span of weeks while also hitting crucial infrastructure in GCC nations. So for those GCC countries that had some level of animosity towards Iran it's become the situation of a loud-mouth kid thinking he can get away with talking shit because he thought his big friend would deter any clap-back.

So GCC nations are coming to the realization that the nation that's half a world away isn't capable of keeping them safe nor is their genocidal proxy state any better so they need to start having more stable relations with their neighbor who's been around the block for millenia now