An umlaut university is finetuning the events leading to our Moon. Yes, it's still Theia. The difference, to the extent there's a difference, is that Theia was very stony - and metally. Theia's core has sunken into Earth's mantle; its own mantle was blown off by earlier crashes before it got here.
So Theia didn't bring water; furthermore, we didn't get a "late-veneer" of water afterward. Apparently our water is similar to that of enstatite chondrites. This blog has mentioned them barely once; as high-density conglomerates mostly rock, forming well in the stone-line like we did. This rock would be low in volatiles... like water. But even minimal water adds up; or, hydrogen-infused molecules in rock might react with rusts.
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