AG didn't fight a ruling to recognize out of state marriages, but he's taking this case to the Missouri State Supreme Court. The good news is that the State Supremes are mostly ones with a high liberal index: 5 very liberal Democratic to 2 Republican appointed judges

Then there's that pending federal case

The state will get it either way!
The AG is also not asking for a stay, he'll let couples marry while the state court case moves up.