Sorry that this question won't be that compact, but we currently discuss in the help forums about the 1-3-1 Zone again and about the placement and dutys of the position. Since in reality they vary a lot.
If we take this nomenlature for the basic formation:
A
B - C - D
E
o|
Who would defend what position?
Is E main work, to run betwen the corners, and should look more like a classical guard defender with lot of outside defence, or are rebounding and Insidedefence main prioritys for this position?
o| = basket