This nuTrek timeline has shown that people who are meant to be born are not only born, but have the job assignments they should have!
I just need to look to Mirror Mirror
or Yesterday's Enterprise
to see the crew all (or at least mostly) coming together in a totally different timeline/alternate reality.
The logical side of me asks:
"How could this be? How did all of these Mirror Universe people all come together to be on the Enterprise -- AND Mirror Kirk, McCoy, Scotty, and Uhura just so happen to be beaming up from the Halken's planet AT THE EXACT MOMENT our heroes were?"
But then the part of me who just wants to enjoy some soft sci-fi entertainment tells that logical side of me:
"Shut up -- I'm trying to watch."