I'm sorry, but the idea that MA is too cheap to pad the entire wall it a little ridiculous. I don't know all of the reasoning behind it, but it seems pretty common to have a gap in padding at the ground in all ballparks around the league. I assume this is because of rain water / mold and so the grounds crew don't snag the pads when raking the field.
With how smart the Brewers org is from top to bottom and always making moves to perform better than the competition, I have to think they are looking anything and everything they can do to keep their players healthy.