No that's not believable to me. They should go with the TOS regular crew size which is over 400. The Enterprise scale in this show is also much bigger than the ship in TOS. That does not work for me. I ding it for that.
No Season one was not ensemble for me. Not even a little. All those bridge officers in roll call should have had larger roles from day one. They are NOT random background extras and if they go back to being such I won't like this season much.
Nonsense....
The dialogue in The Cage establishes the crew compliment as 203. They should abandon that because....I don't know...reasons unknown? Nah....that's just bitching. If they gave another number m a bunch of picky fans would be crying about canon.
The main cast / characters of Discovery was Burnham, Stamets, Tyler, Lorca, Tilley. It wasn't the bridge extras with names. Does Star Trek TOS blow because Lt. Leslie didn't have a lot of lines?