Wasn't a shot, I just didn't want him to get discouraged thinking there might be a few weeks without much progress, so I thought I'd throw a quick 10 day progress shot of a few average seedlings just after pop.
Week three-four has been when stretch starts for me (I'm growing autos), so your dead right about rapid growth at week three. I've got pics here of my last plant over a certain 12 days when stretch kicked in, and you would not believe they were the same plant. didn't notice it at the time but once you look back it's amazing.