It's a bit different though. You don't really NEED to know what they next guy is doing. You NEED to know and fullfill your duty. It's when you start worrying about the others not being in position that things get messed up. If they're used to someone or multiple people screwing up, replacing them can be beneficial immediately as you should start off trusting that the guy beside you knows his role. I hope I explained that well enough....basically new guys who haven't screwed up before can give others confidence in just doing their own job.