One problem is substitutions. I see nothing wrong in a substitution after 25 minutes, when the replaced player has done what is needed. Sadly the idea that the starting eleven will all see out the match does not work. Needed work rate - and level of exhaustion - will vary from player to player, unfortunately we see that players have saved themselves, or are just getting going when we hear the final whistle. Our survival in in the hands of the players, whether first team squad, or from the Academy. Playing Wilf for just forth minutes could be productive, should he not start.