In my humble opinion Marshall is a more special back. He has that extra gear to run away from small fast DBs. His long run against Auburn (IIRC) was a thing of beauty.
With the stable of backs we have, we should be able to run on ANY defense in the country. IF our O line opens the holes these guys will run through them. I saw much improvement last year in the line as a whole. Still have some doubts, however, with another year they should be ok.
Am really interested to see the Douglas kid. De-committed from Tech (which was great to hear in itself), but wanted to play at UGA and that says a lot to me.