In relation to being booed for showing ambition and moving on, that list of players isn't strictly correct, mate. I remember Clive Wilson getting booed when he was still playing for us but had (openly) signed for Chelsea, but had (unusually) been retained by us until the end of the season. The game itself was an abject display, towards the end of the 1986/7 season (but not right at the end of that campaign, when we had a little rally) and I distinctly remember a ten minute spell towards the end of that game (I can't remember against who, I'm afraid) when he was booed by the Kippax every time he touched the ball, although as he was still playing for City at the time you are technically correct ;-)
Agree with the thrust of what you're saying though, I just never pass the up the opportunity to be a smart arse ;-)