Wait a second here....
So "10 years before Kirk and Spock", means that the Enterprise 1701 is out there but it's captain is Captain Pike, and his First Officer is...Spock! Along with the Enterprise are all the other Constitution Class ships which were out there like the Farragut, the Exeter, the Potempkin, the Defiant and all of the ships of the TOS era. They were already more than 10 years old by the time Kirk got a command.
So, the showrunners have dropped the ball, and to begin with they brought a football to play in a baseball game.
In the pre-Kirk time, the planet Talos IV was already a quarantined planet. Also, this alien race which detects death, if the one in Discovery is an officer, then it means that the world he comes from is already a Federation planet, unless a flag officer recommended him to Starfleet. Why wouldn't a Betazoid be more useful? How about detecting lies and manipulation instead of death? Can't a good medical tricorder do that? Even long range sensors can do that.
That's what I get for thinking.
This show is just a mystery of errors and mistakes. How did it get approved?