Think of it this way. You are obviously referring to an offensive player. Generally, offensive players move from back court to front court. Until they establish in their new location, they are still considered in their old location. To establish in their new location, they must not have most recently been in contact with their old location in any way.
As to OOB, it must be the way it is, or you could have players touching the ball with one foot in and one foot out and considered in (same principle as "where you were touching last"). You don't want that.
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