Potential Captains:
- Saru - lacks self-confidence, has a biological tendency towards cowardice, tried to kill a couple officers on Pahvo.
- Admiral Cornwell - possibly psychologically scarred, might end up being a crazy TOS character, seemed to be okay with using a Vulcan ambassador to force-meld with people in the trailer
- Michael Burnham - too many flaws to mention, especially for such a perfect never-do-wrong character. Not sure why she'd be in the running at this point
- Emperor Georgiou - no flaws there. She is technically the most decorated Starfleet captain available (if you go by Burnham's crazy belief in mirror parity)
- Cadet Tilly - she might be a tad inexperienced
All the names here are full of flaws (although, really only Saru and Cornwell are likely. Airiam could potentially jump to CO if Saru is taken out). Another probability is a new character introduced as a Captain (Spoeneman who only was heard in the MU is my bet). In that case, probably not until Season 2.
Although I'm not a fan of the idea of a new Captain every season.
There are many things I like about Saru, but the main one is his sense of dignity. In an environment and real world where that’s sorely lacking
Cornwell would be good as captain though as an admiral it’s probably unlikely. I think Saru is a better 2IC than captain in terms of a lead character for the show
I guess we’ll find out
