Most of what I've read seems to indicate that Addai should see more carries than Brown this season, but Brown will eventually overtake Addai. It probably won't happen this year unless Addai goes down with an injury (which could easily happen considering his history.) The number of carries is a very important factor, but another important thing to consider - especially from a fantasy perspective - is who gets the goalline carries. These two backs seem very similar in terms of build and running style. Is there any reason to think one is better suited than the other for goalline duty?
I'm not sure where this "talk" is coming from about Brown replacing Addai, etc. etc.