~snipped
Here are the registration timestamps:
(u=553627) September 09, 2015, 10:36:49 PM
(u=
553628) September 09, 2015, 10:41:21 PM
(u=553629) September 09, 2015, 10:46:20 PM
So in this case, there was a ~10 minute window (can't know that ahead of time obviously, have to get lucky) to create a new account and get the number that you expected to.
Obviously, anyone with that level of knowledge on a forum they're just registering on couldn't have been a newbie upon registration. They must've been on the forum quite a while before registering that account.
As regards funny usernames, what about
xuO4k04c6Ng They made 1 post and
probably forgot their complicated usernames.
I'm sure this has happened a good few times?
I won't be surprised if that was actually what happened. I hate stuff being made complicated. It's best to keep stuff really simple. If not for hacks and all that, I would be keeping my passwords very easy to remember without having to write them down on paper. Let alone monikers.