Let's not get too ahead of ourselves. DW will be the starter next year, as he should be. He has proven to be a reliable back who has won some games for us. Plus his help in the passing game both recieving and blocking is irreplaceable.
That being said I think that all these recruits all have a lot to bring to the table. It is awesome to finally have a homerun threat from the backfield and some big bodies that can grind out some short yards when necessary. Our backfield will be very solid next year because we could potentially have a back for every situation which is a luxury we haven't had in two years now.
This will save some of the wear and tear on DW, JA, MP, AA, and hopefully Hughes, plus give them all an opportunity to make plays. I will go so far as to say that you will see a Darius Walker next, year that will be better than all his previous ones now that he may not have to carry all the load.