From an animal behavior perspective.....
I have seen similar behaviors w/ other species (w/ first hand knowledge w/ dogs, cats, and turtles).
I have a seriously fat cat, Max, that became a hog after I got a second cat. He totally snarfs down his food. My youngest kitty does this as well, but he usually pukes it up, so he doesn't put on much weight. Max, on the other hand, has totally gained weight....he's not bullimic like Wolfgang!
Our biggist program turtle has become a pig since getting the other turtles. We now feed her seperately from the other turtles b/c she literally steps on the other turtles heads to chow down.
My parents' dog does this as well....well he still does it now even though he's w/ o other dogs. He tends to growl while he eats. You can't get near him when he eats his dinner or even eats a milkbone. He's a little weiner dog, so its funny!
Our program buns...When Jessica and Oreo were cool w/ each other, Oreo would totally chow it up, and often knock the bowl over, and hog the food area.
I think its all pretty normal animal behavior, heck even humans have this problem! I come from a large Irish-Catholic family. My parents always cut up all the good food (i.e. icecream or sweets) into equal portions. My oldest sister would use the "serving suggestions" on the food boxes to portion out our meals. To this day, I'm a major food hog...w/ a hankering for the sweets! I HATE having to share my food! grrrrr grrrrrr...thump....thump