How does some random guy who has never seen combat and works as a janitor get called upon to do that job? Unless it’s all convenient for the plot of course?
This is a major hole. During that first battle, I thought his hesitation was due to his being a spy for the resistance. They tried to justify his behavior later by claiming it was his “first offense”. When he told Han he was in sanitation, it was an immediate wtf moment for me.
Finn is a plot device. He’s whatever he needs to be to help move things along.