Yes carnivores can eat other carnivores. I never disputed that. A lion, apex predatorD), doesn't spend most of it's time hunting other predators does it? Just like your orca doesn't spend most of it's time hunting sharks.
You do get that predators and carnivores are the same thing right? In the picture above the orca is a predator to the fish below it (tuna maybe, i dunno), which is a predator to the smaller fish, which is a predator to the zooplankton.
That is literally quite the opposite of what you said doesn't happen What does most of an animals time have to do with anything? If a predator has another predator as a food source then it eats other predators, something you repeatedly state doesn't happen despite being given numerous examples by numerous people of this exact thing happening. The rate of consumption doesn't remove a predator from a prey list.
From your example, a lion spends most of its time hunting prey. It's prey is anything edible that is weaker than itself. This includes other predators (carnivores) and herbivores.
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