I also agree. While the gorilla may not pack the biggest punch, they are far more agile than the two other contenders. However the bear and hippo have the advantage since they spend a lot of time in the water. What kind of terrain are they fighting on? Either way, The bear would most likely beat the hippo. The hippo is very immobile and wouldn't be able to prevent attacks from behind, like you said. This would leave the bear and the gorilla. The gorilla could easily out maneuver a bear, however if the bear landed a solid blow, it would be lights out for the gorilla. I really think we should get the crew from Deadliest Warrior in on this to decide the winner.