I'm guessing that, even after promotion in 66, City still suffered from an inferiority complex, especially when compared to Law, Charlton and Best.
We needed a touch of arrogant self belief, and Lee's signing was the perfect storm.
Sadly, the BBC bias resulted in dozens of George Best goals preserved for posterity (even in games where United lost) and just a few flickering images of Lee's brilliance, so I'll have to imagine his vital goals at Anfield and Old Trafford in 67-68, or even the late FA Cup Quarter Final winner v Tottenham the following season.
As for the OP's original question, I remember sitting in the Platt Lane in the 1970s and listening to the old timers regale me with tales of Eric Brook, Fred Tilson, and Peter Doherty, and how they would walk into the current team.
Fifty years later, I smile to myself in the role of old timer, just happy that I witnessed the last few years of Bell, Lee, and Summerbee.
A completely different era when football seemed more innocent, but probably wasn't. No point in comparing. Just happy that City are doing so well.