They have marginally better records than Sobers, which is the point. You think that Abdul Qadir was one of the greatest ever leg-spinners, but Sobers was rubbish because he averages 2 more with the ball? Give me a break. I suppose Thommo was a mediocre bowler because he averaged 28 as well? Not to mention Larwood, Wes Hall etc? While George Lohmann was the greatest there's ever been?
Anyway, I have made all sorts of points about Sobers bowling, but obviously the only evidence you will accept is statistical, so I'm not going to bother.
Suffice to say, as I have, that Sobers was not just slightly but much better than Kallis, with bat, ball and in the field. Kallis, if he manages to perform against Australia some time, may have a case to be a great at the end of his career as well, but Sobers is the only player who can come within touching distance of Bradman, and is so far ahead of every other all-rounder in history that it's not funny. The fact that his average finished up as 34 with the ball is neither here nor there, as he remained a genuine threat with the ball throughout his career against all opposition and was one of the most prolific wicket takers of his era, which is far more than Kallis can claim.