As far as I can tell his main job is to keep Pac in the dark about his finances.
This is what Koncz and many surrounding Pacquiao are:
http://cdn.theatlantic.com/static/mt/assets/food/MaggotTherapy-Post.jpg
But in defense of maggots, Manny makes it easy when he just lies there like a corpse. What's he expect them to do, not feed on his lethargic flesh?