They ran for 300 as a team last time they played so I would figure they would have lots of yards to go around. If you figure 80 for Vick and 100+ for Dunn that would leave plenty for Norwood if they can get it going like they did the first time around. Mora dropped a lot of manlove for Norwood in his press clippings this week, I think he gets more than his usual 10 carries (12-15 my gut tells me). They love running him late as evinced by his 4th quarter stats, so getting him a involved "a little earlier in the game" tells me they plan to come closer to a shared backfied this week. Dunn is the man, but they will likely run A LOT this week.
ETA: If the Falcons can get a nice lead early and they have the momentum, I could see Dunn resting the second half and it becoming the Norwood show. Just an if, but this week feels to me like a turning point for Norwoods value.