Much as I love and adore Finn, he is not going to get the victory arc. The reason is that "Sam" (as he was originally called) was only ever supposed to be a sidekick to Rey in the first movie, and then largely or completely disappear afterward. (Poe, meanwhile, was supposed to die in the first film and never be seen again, only Oscar Isaac talked JJ Abrams out of it.) However, when it became clear that the fans loved Finn and Poe and were eager to see more of them, there was a fair bit of scrambling to add B-plots into the script of TLJ to accommodate them. If the Canto Bight and Poe-becoming-a-Leader subplots feel less well developed than Rey and Kylo's, that's why. (And I agree with you about Poe, although I think he should have been court-marshalled for mutiny and treason instead. He's just lucky he's pretty, I guess?)
You are also not likely to see Kylo trisected by Finn, or indeed any significant clash between them, because the tension between the Last Jedi aka Rey and the "Jedi Killer" aka Ben Solo has always been the intended A-plot of the movies. Indeed it's likely that in Kylo we're seeing Anakin's story in reverse: from Darth Vader-wannabe to tortured antihero to true hero in the final film. The reason Kylo is still positioned as the villain who has rejected every chance given to him is because no one can save Ben until he recognizes the hollowness of the Dark Side and chooses the Light for himself, instead of merely being torn apart by his inability to commit and his obsession with his own family legacy. Getting rid of Snoke, who has been manipulating and bullying Ben Solo literally since before he was born (that's not in the movies, but it's hinted at in Leia's dialogue in TFA and confirmed in the Aftermath novels) is a good start, but there's still a way to go.
I know that doesn't make a lot of people happy because they believe Kylo is irredeemable and deserves nothing but death, but I think TLJ was pretty blatant that a guy who slippy-slides down the corridor in his socks and gets shy being caught with his shirt off is not someone the filmmakers want us to regard as a hardened villain. Even at the end when he's unhinged by Rey's rejection and Luke's Force-appearance on Crait, he comes off as pathetic and hysterical, more like a teenaged boy having a tantrum than a cold-blooded killer who's going to be the Big Bad of the third film.
It's still possible that Kylo will die, I guess, but if so it will probably be sacrificial in some way and won't be painted as anything to cheer about. We've spent far too much time being reminded of who Ben Solo was and could have been for that.
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You are also not likely to see Kylo trisected by Finn, or indeed any significant clash between them, because the tension between the Last Jedi aka Rey and the "Jedi Killer" aka Ben Solo has always been the intended A-plot of the movies. Indeed it's likely that in Kylo we're seeing Anakin's story in reverse: from Darth Vader-wannabe to tortured antihero to true hero in the final film. The reason Kylo is still positioned as the villain who has rejected every chance given to him is because no one can save Ben until he recognizes the hollowness of the Dark Side and chooses the Light for himself, instead of merely being torn apart by his inability to commit and his obsession with his own family legacy. Getting rid of Snoke, who has been manipulating and bullying Ben Solo literally since before he was born (that's not in the movies, but it's hinted at in Leia's dialogue in TFA and confirmed in the Aftermath novels) is a good start, but there's still a way to go.
I know that doesn't make a lot of people happy because they believe Kylo is irredeemable and deserves nothing but death, but I think TLJ was pretty blatant that a guy who slippy-slides down the corridor in his socks and gets shy being caught with his shirt off is not someone the filmmakers want us to regard as a hardened villain. Even at the end when he's unhinged by Rey's rejection and Luke's Force-appearance on Crait, he comes off as pathetic and hysterical, more like a teenaged boy having a tantrum than a cold-blooded killer who's going to be the Big Bad of the third film.
It's still possible that Kylo will die, I guess, but if so it will probably be sacrificial in some way and won't be painted as anything to cheer about. We've spent far too much time being reminded of who Ben Solo was and could have been for that.