Karnak's focus
So I recently pulled Karnak and was looking over his abilities to decide if I should rank him up to pair with my Medusa. His base crit rating of 327 gives him a 14% chance to land a crit. When focused he gains nearly 4,000 additional crit rating. Shouldn't that make his crit rating 100%? I tested this theory and he certainly doesn't crit on every attack. My question is why doesn't he when based on the math his crit rating would exceed 100%