In fairness, a lot of coaches don't do that in a 4-3-3 and often want the (Example):
> LW is crossing
> LB Overlaps
> CF & RCAM Attack the Box
> RW hangs a little incase cross over hit and RB inside the pitch
But I am like you, fill the posts in a 4-3-3:
> RW at back
> RCAM Edge
> CF Across the Post/6 Yard Box