No team has ever collapsed in injury time directly because there are 23,000 people at the final whistle as opposed to 28,000. If the Albion fail to score in the final minutes, it's because their decision-making and poise in attack is not good enough, not because they are not spurred on by a loud...
Gus would have more pressing problems if his players were looking to the stands for inspiration in the final minutes of a game rather than figuring out what it is they have to do to unlock a defence with their attacking play.