I don't see the comparison in Marshall with D.D., but I do see a young Emmit in him. With a little better speed, hes not near as fast and elusive as Marshall, sorry
I think a young Emmit with a little speed is the best comparison. Emmit makes moves, even at his age now, so you can't say " oh Emmit diden't make the moves D.D. did ", because he did when he was young. Priest is also a good comparison. But Barry Sanders? I don't think theres any similarity, both have different running styles. Barry coulden't break tackles, he was pure moves and speed.