If Z dropped as much weight as Cal said, then he's got to get back in shape and attuned to college speed. His first night was a flash in the pan. Was easy to see that his productivity dropped once Georgia began keying in on him.
Z is good – he can be really good. However, throwing him to the wolves in an away game wouldn't be a great situation. Yes, he's been conditioning. Yes, he's been practicing. Unfortunately, it's been stated that Z didn't get certain practice reps because he wasn't going to be contributing minutes.
He's used to Euro Ball, not NCAAMBB. He's making mistakes/committing fouls that American players don't usually make, which I suspect contributed to Cal not trusting him in a tight away game against a raucous crowd. Z also has a nasty habit of looking to/pleading with the ref when he doesn't get a call. That makes him a liability in a fast-paced SEC game and also liable to earn a technical. He's got to get game minutes, but not at the cost of a W.
Z will come into his own with time. I agree he's better than Bradshaw right now, who for whatever reason can't seem to understand that you can't go over the back of an opposing player for a rebound – but I digress....