I know nothing about baseball.
Of coarse you can project 3D stuff to a 2D plane. But you loose some information.
Let's take Billiards for example. We likely use the tables surface as the projection plane. It works well enough we can make a top down billiards game. But some things are not possible, like one ball jumping over another ball. Our 2D simulation would lack the dimension of height, so the two balls would collide in our simulation, while in reality the would not.
Still, our 2D game can be quite a realistic simulation, because such special cases rarely affect the game. Same holds for soccer, almost.
For baseball it's a bit more problematic, because the balls height covers a big range, and vertical ball movement is very important. Dribbling with the ball constantly moves it up and down, hitting the goal requires to hit its height, etc.
Still, a simplified 2D baseball game can work and can be fun.
And making a 3D simulation of baseball won't be realistic either, because we can not yet simulate humans. We use animations instead, which is a big compromise especially for sports games.
You'd need to explain K-Zone, or your specific worries and goals in more detail, maybe.