Kallis himself had a pretty poor start to international cricket. As did Amla and AB. His temperament and technique is what the coaches are there for, and he's not going to get the same level of exposure and coaching at domestic level. Our domestic leagues are pretty competitive and it's generally a good indicator of who can make it at international level. 7 (or 8) games are far too few to judge somebody on their average, 4 games are even worse.