Do Wookiees seek revenge? (Excepting the Wooks gone bad in the EU past and present.) That’s a good question. Chewie would look nasty just killing Kylo in cold blood. I can’t see him doing it unless Kylo is about to kill someone, and it’s the only way to save them.
It’s equally possible Kylo turns away from the dark side long enough to do something good, but dies in the process. Like Grandfather, like Grandson. Think about it, won’t you? 😉
I have thought about it Silverwook, and I’ve no doubt Kylo’s character WILL end up being given the kind of conclusion you describe…it’s just I’d rather he didn’t get the same kind of end as Vader did, as I’ve had my fill of this whole ‘mirroring’ thing, and would prefer something more unexpected. 😉
I’d happily settle for Chewie taking out Kylo to save someone however, and another way would be for him to be piloting the Falcon when he does - I can just hear him ‘laughing it up’ afterwards…