Plot Hole Explained? SPOILERS obviously
SPOILERS VVV
Why didn't the gang just shoot all of them when they had the chance? I think I've got it.
On rewatch the coffee is poisoned when they first enter because the gang doesn't want a gunfight that could kill Daisy. They originally hoped they could just let everyone die without risking anything.
Likewise the Lincon letter. If they kill Warren there worried of the supposed consequences. Would the army come hunting them down?
And right when they find out its fake Warren proves how fast a draw he is by killing the old man. Making firing guns way more of a risk.
So at that point the gang figures the best cause of action is to just wait. Right after this John drinks the coffee and the guy under the floor is kind of forced into shooting when Sam Jackson's character lines everyone up.