From earlier singles discussion; Dark Horse has to be 3rd. It's going to continue to linger. If it's not next, they shouldn't waste time on it all in the future. I know it'd be like the 3rd consecutive mid-tempoish song, but it's clearly performing very well. I wouldn't do it worldwide though. "TIHWD" is a bop, but that would fall short I feel like. Masses won't buy that song.
I didn't list "Walking with Jesus" in my singles because it's not performing well in the US and she needs to keep getting #1s and slay some others, but maybe it can be the WW choice while "Dark Red" is in America. Then a collective "Birthday" release as the 4th single.
I think Walking On Air would be a hit though. I'll keep watching it over the next month or two though.