I wouldn't look at Edge's numbers as a comparision. Edge was the first RB drafted, ahead of Ricky Williams, in the top 5. Addai is not that caliber of back. Besides, Indy has an 1100 yard rusher on the roster in Dominic Rhodes, and you better believe that he's going to get playing time. Indy is in win-now mode, and they will not rely on a rookie to be the rushing offense. Addai and Rhodes will split time all year, unless one of them simply blows the other guy out of the water. I don't see that happening though, so RBBC here.
The flaw in that argument is that if Indy had so much faith in Rhodes, why did they draft a RB so high? They could've drafted someone in the mid rounds if they thought Rhodes could get it done. Rhodes did alright in a system that he should've done a lot better than alright. In particular,
I believe Manning got sacked a lot the year Rhodes got his 1K yards. That can't happen. Rhodes has been in the league for a while and still doesn't block well. Looks like the Colts will look to teach a rookie rather than rely on an old dog that can't learn new tricks.
BTW, I own Rhodes in a Dynasty League.