Kallis was crap at the start of his career. Ponting was OK. Kallis got his biggest average year in 2007, Ponting in 2003. They were not on the same quality timetable.
I've never argued Ponting wasn't rated ahead at this point (and have made the more meaningful point that he should have been rated ahead).
Granted on the correction about Ponting's numbers in his peak, I was looking at his victory averages by mistake.
Neither Ponting nor Kallis had made a big splash until 99 so bringing up Ponting's rating before then is irrelevant.
It's quite obvious that Ponting being rated far ahead of Kallis 99 to 2007 was because of how he was playing, the fear factorcombined with heavy runscoring which was missing from Kallis.
Kallis finished stronger. People at point x in their careers had no idea this was going to happen. Why rely on their incomplete info when you have access to the rest of their careers?
Purely for the sake of argument, say Kallis had a career that was a hair better. If ratings at the time were correct (which they often aren't), Ponting would have been rated ahead until the 2010s. But Kallis would still be better.
Yes, Kallis finished stronger and his peer rating also grew at that point. Late career performances do affect career ratings. If you asked in 2010 who was a better bat, people would say Kallis at that point. But if you asked end career, Ponting would be rated higher as an overall bat based on a larger share of his earlier career, but it would be closer than if he had retired in 2006. Peer rating isn't fixed.
Sheer volume of work does affect career rating. If you had McGrath retiring mid career in 2000, he wouldn't compete in peer rating with Wasim and Ambrose as he does since he retired in 2007.
You recognize why this system of yours can create problematic ratings. You are saying that it's not relevant in this case because the late career advantage of Kallis is not enough to catchup. That's fine. But then simply say Ponting had a better career. There is no need to introduce an inherently flawed extra layer.
It's not that complicated. Generally speaking, between two players of overlapping careers, who was rated as a better bat by the cricket fraternity is a measure to help in assessing their overall quality.
There are exceptions like Lillee who has a super high rating but virtually no competition for a decade, and his rating can be taken with more