That's a pretty low thresh hold. Daniel Gibson was able to produce next to Lebron. Cedi was able to produce next to Lebron. Sexton would be able to produce next to Lebron. I bet the over bone chunks from my wife's bunion surgery would be able to produce next to Lebron. Cavs problem is that they need players that can produce when they are not playing next to Lebron.
That said, Zizic is looking like one of the better players on the team. He just way shy of being able to a team out of the mud by himself. And that makes him a pretty replaceable guy, much like the rest of the roster. He's probably better than Zeller, but I can't convince myself that he's a whole lot better than Zeller was in 2013.