<image>As shown in the figure $$1$$, the graph of the linear function $$y = kx - 6(k \neq 0)$$ intersects the $$y$$-axis at point $$A$$ and intersects the graph of the inverse proportional function $$y = \dfrac{8}{x}(x > 0)$$ at point $$B(4, b)$$.
$$(1)b =$$ ______ ; $$k =$$ ______ ; 
$$(2)$$ Point $$C$$ is a point on line segment $$AB$$. A line $$l$$ passing through point $$C$$ and parallel to the $$y$$-axis intersects the graph of the inverse proportional function at point $$D$$. Connect $$OC$$, $$OD$$, and $$BD$$. If the area of quadrilateral $$OCBD$$ is $$S_{quadrilateral OCBD} = \dfrac{42}{5}$$, find the coordinates of point $$C$$.
$$(3)$$ Translate $$\triangle OCD$$ along the direction of ray $$AB$$ by a certain distance to obtain $$\triangle O{{'}}C{{'}}D{{'}}$$. If the corresponding point $$O{{'}}$$ of point $$O$$ falls exactly on the graph of the inverse proportional function (as shown in figure $$2$$), find the coordinates of the corresponding point $$D{{'}}$$ of point $$D$$.
