It's not gonna happen.
Splitting St. Louis would be an instant dummymander. Even Kansas City would be risky, considering that the whole metro is growing and getting bluer.
False,
Missouri 5th was +20 Obama in 2012 and +18 Biden
Missouri 6 was +22 Romney and +28 Trump
Missouri 4 was +25 Romney and +34 Trump.
Platte has been getting bluer but Clay and Jackson haven't. The rest has zoomed rightwards.
Clay went from Romney +8 to Trump +4 and Jackson went from Obama +20 (2012) to Biden +22. It's rural areas in those districts that have swung hard right.