Okafor post ups are like bonds in your portfolio, if this makes any sense. A 40 year old will ideally allocate 10-20% of their portfolio to bonds, from which you can expect decent (i.e., above national inflation), consistent, low-risk returns. You'll get about 3% returns with bonds over the long run and, even over the course of only one year, you'll rarely get awful returns. They smooth out your overall performance from year to year. They're not what you rely on to win big, though, and even when they perform well, raising them to a much larger portion of your portfolio isn't going to be able to get you positive returns when your other more volatile investments are tanking.
The guards and Winslow are your stocks. They should be the bulk of your portfolio, about 80%, because they return about 7% over the long run. But they're not as consistent as bonds, so they're generally high risk. When they go bad, you will get crushed, and your consistent 3% returns from the bonds isn't going to save the occasional awful year out of your 30-40 year time horizon before retirement. It really doesn't matter what your bonds do from year to year. You'll have a few big losing years out of 30-40 with this portfolio, but you'll win much more over the long run than if you were heavily invested in bonds. Your ceiling is much higher. If you were to use all bonds and no stocks at all, you simply would not beat a decent portfolio over the long run.
The nice thing is, Duke is one of only a small number of teams in the country with a bond fund. Other teams may try to go with 10-20% usage of post ups, but the guy posting up needs to be amazingly talented to get you decent returns since post ups are so relatively inefficient. Okafor post ups smooth out the results from game to game, but they have very little impact on whether Duke wins or loses - they are never going to get you crazy efficiency or miserable efficiency. It's all about the guards and Winslow shooting well and not turning it over. The more Duke has to depend on and use Okafor in any given game, the lower the ceiling is for Duke's performance in that game. Duke is going to need a high ceiling to beat other elite teams, so if the guards and Winslow suck and Duke needs to rely on a ton of Okafor post ups in the Elite Eight and beyond, then Duke might as well forfeit.