From an across-the-border perspective, I think Greitens win by more than 5 points, though I would definitely prefer it if Hanaway pulled off the upset.
If the election were held a month ago, Greitens would have won this way, though it's a lot more uncertain after he got bombarded the way Brunner did earlier. There's also been a big uptick in negative ads for Hanaway in the final week, while Kinder has gone pretty much untouched and forgotten. I think there's actually a non-negligible chance that Kinder could come out as the winner (or at least be in the top two) if voters are really disgusted by the circular firing squad over the airwaves. Kinder hasn't been aggressive in his campaign to say the least, though, and he's already had the stench of a has-been for a while, so I wouldn't bet on it.