Any reason you can think of for why the 5th stretches out that far? I Assume it's intended to prevent Ike Skelton from running again (as he lives in Lafayette county), but it draws the 6th dangerously far into Jackson county.
Either way, this is almost certainly going to be vetoed by Nixon. It eliminates Carnahan's district, and I'm pretty sure all the other Republicans are safe in their districts.
I would imagine they had Skelton in mind when they put this together, even though it's doubtful he'd run again. Republicans can override the veto in enough black legislators vote for the bill and it's not clear if they will get those votes.