You could in theory have a rogue wave only an inch tall, provided the highest expected wave was only fractions of an inch tall. This has nothing to do with the

You could in theory have a rogue wave only an inch tall, provided the highest expected wave was only fractions of an inch tall. This has nothing to do with the absolute size of the wave, but it's size relative to the other waves. Now this article dramatizes a wave that is dozens of feet tall, that's what's rarer.