Can't imagine what the specifics were that caused him to be locked out.
I am greatly relieved, because the tone of some of the first mentions of him in this thread sounded more dire to me than just being locked-out. I was afraid that he had died, or was terribly sick or injured. I am glad to know that is not the case.
However, while I don't know the specifics, I can easily imagine the general scenario which tripped him up. Despite his intelligence and wit, he had a tendency to over-personalize discussions and arguments, and become obsessed with winning the argument and "beating his opponent" versus determining the facts and truth of the issue. We are all guilty of this from time to time, but it's best to try to keep those urges under control.
I do have a fond remembrance of him, however, during the Hurricane Rita threads in 2005, when people were trying to evacuate Houston. Sink was on those threads graciously offering his own home as shelter to his fellow Freepers. That was a class act. I wish him well, and hope he can return here one day soon.
Based upon your analysis, his pride might be too much for him to return.
He's a good man and a wonderful friend.
I hope he can, too.
Plenty of other posters have had time outs and returned.
And a lot of banned Freepers just come back under another name; as I understand it, he won't do that because it's against forum rules.
I remember those threads as well, and he even offered to take in families who had small pets.