I've read all his books multiple times, PJ. Something tells me we agree on other things as well but what's the fun of that...HA!
The Hepburn book is simply one of the greatest biographies of an entertainer I have ever read (It ranks with "Garbo" by Barry Paris and "Brando" by Peter Manso as revisionist and detailed to the point of minutia - just like I like it).
I think what Mann is going for is that without Barbra - everyone from Midler to Madonna to Gaga and Adele would have had to invent.
There was a "norm" for stardom. A normal way of looking, speaking, singing, behaving.
Barbra broke and destroyed "the norm"!
I actually had a chance to speak with Mann, briefly, and suggested he tackle Alain Delon one day because THAT'S a story waiting to be told...
"There's no damn business like show business - you have to smile to keep from throwing up." - Billie Holiday