I have to search for loss behind my walkers and usually when I do find a seed I wonder if it wasnt there before the machine made that pass. You make it sound like the walkers do all the seperation however in fact if you dont have the cylinder do 98% of the threshing you will have loss, The shoe in a 9600 wont loose any grain if set up right. Ill give you an easy example, in heavy yield 64lb bushel weight white wheat I had a 9600 with 30ft head cutting 3.5 mph with 1/2 bushel/acre loss, the other identical 9600 with ZERO loss, operator of the first rig was pulling his hair out, could not figure out where the loss was, closing the concave from 2 to 1 eliminated all loss making the two operate once again identical in speed and loss, only difference in the two is one had more hours on the rasp bars and the moisture was still up from the dew. Both machines have the beater grate in the bottom position and no beater curtains. And another thing, EVERYONE knows rotor machines take more HP and burn more fuel, my walkers use maybe 80 gallons in a 12+ hour run in heavy wheat.