@hightor,
You wouldn't know if you'd not been here when he posted as Red Rex all the time.
A few years ago he opened the Cobbler account and did the majority of his posts on that keeping Red Rex for music.
I don't know why, and as I'm not his favourite person right now, I don't think he's likely to tell me.
I'm with you, I think we should stick to one username unless something happens to the old one. There are some posters who've had to open a new account because of problems with the old one, but they tend to be upfront about it. Ossobucco posted as NewOssobucco and Contrex posted as Centrox. I don't have a problem with that at all.
Then there's the sneaky ones. Finn d'Abuzz posted as DoctorGonzo, or something similar, for about 3-4 months before coming clean and then trying to pretend it was some sort of experiment.