Re: Uhura replacing McCoy/Bones?
Uhura 'lost out' because the character was written as a glorified extra from the start. Nothing more, nothing less. Nimoy and Shatner's egos had nothing to do with it.
Some say that daylight savings time was implemented to give him another hour of track time and that he goes through Pon Farr every 7 seconds.
All we know is, he's called The Stig.