The good ones have pocket presence and know when they're too deep or need to move around. That doesn't take a genetic mutation, just smarts by practicing having a clock in your head. I remember A Rogers talking about how at practice he has giants clocks around the field so he can gauge when the pocket breaks down and he needs to abandon/move the pocket. No I'm not saying Joe is or will be or even should be Aaron Rogers. But this is an example of how that skill is learned.
It's hardly news that his presence back there is poor.