Wednesday question

[Opie]

I am kind of new at this, and I mean no disrespect to anyone, I'm just trying to understand.
There are times when a ball breaks the sideline plane, but is still not out of bounds, i.e. a ball carrier with the ball in his outside hand running very close to the sideline. If he goes out of bounds the ball is spotted where the front of the ball is where he goes out of bounds.
If a player near the sideline leaps toward the EZ and has the ball in his outside hand the ball may be out of bounds momentarily beyond the plane of the sideline, but it could be brought back and cross the EZ inside the pylon.
Or he could smack the front of the pylon with the ball. Considering the width of a football, wouldn't part of the ball be breaking the goaline plane? Does all of the ball have to break the plan or just part of it? I thought that any part of the ball breaking the plane was a TD. Just my humble opinion.