I hear this from announcers a lot when the 2nd string/bench players don't produce. Isn't it the coaches responsibility to recruit good and develop players to prepare like they are the starters? I can only defend if injuries crippled a team at a certain position and down to your 4th string. Maybe, I have the 90s football mindset when 5th string running back Jay Sims would come in and rush for 100 yards and was the weightlifter of the year.