I think Pop is playing big right now because he doesn't like the rotation if Diaw starts. I also think he likes Diaw's play-making off the bench more than Splitter's contributions to the starting unit. I don't think this current lineup is sustainable. Williams, in my opinion, would be an excellent fit for the starting unit. I think he'd fit with Duncan a lot more than would with Splitter. But I guess Diaw would be an interesting front-court partner for him, too. I just don't think the Spurs would trade for him this year without him playing a lot of minutes. In June, maybe, but not this season.