Doesn't matter. Like I said Asik will get you more offensive boards. Besides, most centers stay around the basket anyway. Dwight sure doesn't leave it. And besides, we will still be playing large stretches of the game with Ryno/AD (baring a trade).
When you look at Reke this year he was playing with backups and still managed to have good games. When you look at a fully healthy team I see no way he doesn't play better. Adding Asik won't change that.
The whole SF thing will work itself out. Heck, if we don't get one Reke will most likely be starting there.