So we agree that there are a few possibilities as to why Martinez chose to replace a keeper that had kept three clean sheets in a row with a keeper who jumps out of the way of a ball when someone shoots at him.
You have spoken about the possibility of Martinez witnessing Howard perform good in training. I have spoken about the possibility of favouritism being applied, and the possibility that Martinez is too scared to drop Howard because he fears the reaction of the clique in the dressing room.
You obviously think it is more likely that Martinez made this decision based on Howard's training ground performances, I disagree and think it more to do with him being scared as to how some of the players would react, which is extremely poor management.