We'll have to disagree on the importance of being able to score consistently in the post. As for the Al/Sap debate, I tried to explain the decision is not simply about retaining the "best" player. It's about what makes the most practical sense. Trading Sap is easier and likely to bring back better value because of his contract. Letting Al expire subtracts 15 million from the Cap Figure.
As to the actual player debate, in my opinion we'd be better with Favors lined up next to Al than Sap. I could change my mind on that if I believed Favors was ready to reliably create shots for himself. But I don't think he is, thus I'd rather have him playing next to a guy who can as he continues to develop. By the end of next season I would expect Favors to be ready.