th author seems to endores the view that good players "at peak" should only be kept in the squad.
this sounds good by logic, but cricket is not a game won by logic, its more of a mind game and the camaraderie that players have among themselves matters most.
Rather than the pitch, its the atmosphere in the dressing room that decide if a team is going to win and lsoe.
While playing 'fit' players is important, it is of utmost importance that it should not be done at the cost of team spirit. You never know who gets out for a duck or who makes a century, so that this whole notion of 'inform player' is itself subjective.
However you do know that if players are committed to each other and are motivated, they can win, irrespective of their individual forms.
Durin this edition of the world cup, you could say from the body language that the players could not win. seems they lacked team spirit and motivation. They lacked in their minds, not in their fitness or form as suggested by the author.