improve water retention on the slope for the plants
Create a divers micro-topography that results in more microsites for a wide variety of plants to grow. Some do good on the tops of hummocks, while the the more shade and thirstier spp. do well in the hollows.
Big game
They certainly have a role, but I think there's a lot more preferential browsing sources for them in the surrounding areas, rather than this area. It's just recovering, and doesn't likely offer that great of a food source for them, when there are old growth forests near by.