Here is the scene after Oven was knocked to the ground. He was never knocked out. He immediately gets up and attacks Pound.
It works better when you post the entire scenes related to the situation not just the ones you want people to see.
Luffy was down but wasn't out.
Here is the scenes after Zoro oneshot Apoo. What do you notice or don't you notice. That is Apoo up and moving. We don't see him for the rest of the chapter which indicates he's out.
If Oda wanted to show us Apoo immediately got up he would have showed us that like he did with Oven.