Furball
Evil Scotsman
Because Gilchrist kept to far better bowlers than Healy did. The statistical method you're advocating has Kamran Akmal as the 3rd best keeper of all time amongst keepers that have played at least 20 Tests, which is quite clearly nonsense.A lot of the best teams had fine wicket-keepers. Why is Healy considered better than Gilchrist when both generally had fantastic attacks yet Gilchrist blows him out of the water when you consider catches/inning? It seems pretty arbitrary.
Warne himself reckons Healy was a better keeper. Judging wicketkeepers is something that I'm loathe to do as I have absolutely no appreciation of what makes an outstanding keeper rather than a very good one. Obviously I can appreciate the difference between a good keeper like Prior and a poor one like Kieswetter but I have no idea why someone like Healy would be regarded as better than Gilchrist. So I'm quite happy to defer to people who actually know what they're talking about in this instance.