The most frequent method of dismissal in cricket is being caught out by fielders other than the wicketkeeper. Detailed analysis reveals that, between 1877 and 2012, the method accounted for around 40 percent in Test cricket.
This is confirmed by analysis of post-2012 data. When the 20 percent caught by wicketkeepers is added, the total percentage of dismissals achieved by catches rises to 60 percent.
Wicketkeepers also effect stumpings, some 2 percent of dismissals. Given the level of importance attached to this single position, it would be reasonable to assume that the selectors of a team would always choose their best wicketkeeper.
An early precedent was set for this concept. In the first ever Test, between Australia and England at Melbourne in 1877, Jack Blackham was selected for Australia ahead of Billy Murdoch because Blackham was considered to be a superior keeper.