DeMar is far more effective as a SG? Stat wise he's better at the SF - not by much but he is(82games). OJ wouldn't be a bench player - he just needed to do some maturing. He's definitely a starter in this league.
I completely agree with the center issue but we're not getting one in free agency when so many teams need one unless we trade, go to Europe or draft. Big men seem to be a premium in this league right now.