Add up the percentages and the Vikings' comes to 126.1%, meaning the Vikings were in a 2-back set 26.1% of the time, plus a few more to cancel out the rare times they went empty backfield.
The Rams RBs add up to only 99%. This means they were in empty backfield sets more often than they were in 2-back.
Barring injury, this tells me we'll be seeing a lot less of Ham and also less of Mattison this season.
