You know, I just realize the point of the casino sublot. It wasn't to serve the story at all, it was merely a film contrivance.
After The force Awakens, one of the many niggly bits that people had was that Finn had a showdown with TR8R, rather than Phasma. Everyone called it a wasted opportunity.
So IMHO, the entire point to the casino subplot was simple: They needed to get Finn aboard the Star destroyer so that he could have a sword fight with Phasma.
That's it. That's all.
Which tells me that Finn should have died at the end of The Force Awakens. That would have completed his arc in a way that would have given Rey even more fire against Kylo ren
The failure is the whole point of the Finn and Rose side mission. Well, one of the points anyway in Poe. Poe is constantly disregarding orders. Leia, who has a soft spot for roguish figures, is constantly trying to teach him about being a leader and that not every hair brained scheme is worth the toll. So, he sets up the side mission. Typically in Star Wars, these side missions are what saves the day. This one fails. WORSE, he is telling Finn and Rose Holdo's plan over the communicator where JD can hear and he sells them out. By disregarding a highly experienced leader (Holdo) he has screwed stuff up!
This is a"learning" moment for Poe. On Crait, he realizes that their goal of trying to buy time in combination with the cannon defenses the pilots will just get wiped out. Usually he (personally) would just rush the objective. Instead, he tells the pilots to pull back.
The other points of the side mission is for Finn to realize there is more to the Resistance through Rose, someone that has good reason to hate the FO and even through trials and tribulation does not run away like Finn constantly tries to do.
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