Kristic can ball on the offensive side in a way Perk never could. Yes, we lose D with Perk (well...we really didn't when he didn't play most of the season, but that's a different story), but we gain a ton on offense with Kristic. The +/- could cancel out. Seriously. Perk was a liability on offense. Watch Game 6 of the Thunder/Lakers series. Kristic goes to work early and often vs. LA. Perk would never, ever, ever be able to do that. Throw in Murphy and Shaq and JO and we still have some serious power at the 5. Plus that Jeff Green fellow.