biceps pull in a straight line from the insertion points, you just need to find an excrcise that works the muscle through its fullest range of motion, all the different excercises do almost exactly the same thing, just with different degrees of effectiveness, some you dont even ned to bother with at all
So you're telling me and everybody else that the biceps don't also (I'll explain in layman's terms so you understand) "twist the pinki to the sky"

That's what you're saying?