You might have to move his bedtime up, but it won't automatically lead to an EW. In theory, if you get the time exactly right, he will just add to his night sleep.
And as Stephanie says, you can't actually put your entire life on hold because of his EASY. It's a tool designed to make things easier and more predictable, not a hard and fast routine that means that you can't get normal day-to-day things done. It's also worth bearing in mind that early bedtimes, EWs and missed naps are pretty much inevitable at some stage, even if your EASY is absolutely perfect!