Mann's Hepburn book is fantastic. He implies everything that we think we know about her is horse****! She created a character called "Katherine Hepburn" and refined and tweaked her when needed. Tracy and Hepburn were bisexuals who fell in love (much like Rob Pattinson and Kristen Stewart today) and then remained connected by a true friendship. That said, she really did take care of him up to and including his final hours.
I don't know why anyone is shocked by anything Scotty Bowers says. As Cher once said "The American public thinks they know everything about this town and really, they know nothing".
"There's no damn business like show business - you have to smile to keep from throwing up." - Billie Holiday