Who should keep wicket? Foulkes is a world class keeper but is an average batsman.
Bairstow has the gloves because he is a better batsman. 78, 20, 17, 10 and 12 are his five scores to date. Does that warrant him being above Foulkes. I haven't got Bairstow's keeping stats but I am sure they are rather poor.
Is there room for both?
