The robot will provide some extra circulation for your deep end. Is it a good substitute for the MD, but a designated line to pull that lower water is better. (JMO) There are other options, I mentioned 1 of them in my earlier post (about the 'reserve line). It helps to have the water in the deep end moving around - the robot will 'at least' stir things up down there.

Let us know a little more about the 'suction/ return' system on your pool - another idea might just come