I have the impression that seasons 2 of the Tekken games are either what-if (like Jin in Tekken 7: Fated Retribution) or there to tell what happened off-screen within the season 1 (the helicopter shooting Nina and in Tekken 5: Dark Resurrection, Lili and Sergei are shown there doing their individual stuff during the same time of Tekken 5 before a new era starts). So I think that, *if* it happens, it will show Miguel fighting Jin and a few others but it will be implied (even with the possibility of him winning) that he will fail to achieve his goal due to the main story of Tekken 8.
But, let's imagine...
INTRO: Miguel finds Jin in a very nice place... I'm imagining somewhere full of plants, maybe even a new stage (probably).
Miguel: Finally. It's time to take this bastard out.
PRE-FIGHT (Miguel Vs. Jin)
Miguel: now, terrorist, I am going to teach you how it is to lose everything!Jin: if I could go back in time, I would not have done this. All I can do now is atone for my sins.Miguel: Don't be ridiculous, demon! Do you really think you can atone for the death of an innocent?
Rage Art
I'm imagining him doing something very punch-focused, him punching Jin in all his body sending him to the air with his fists in the anger of a prisoner of war, with memories of his sister coming and him screaming more than Jin while aiming for his face, his bones and his head.
After the last blow...
Miguel: GO TO HELL!
If Miguel wins...Miguel: I might have given away my possibility of salvation... but if I go to hell, I want to at least take this evil sinner with me. Everything for your sake, my beloved sister.(Jin's rage art would be something like: if you kill me now, you will never know!)If Jin wins...Jin: I hope I can make it up for you one day. I don't know how, I don't expect your forgiveness, but I'll live trying.
DLC characters often have interactions with other characters, so let me imagine a bit more.
PRE-FIGHT (Miguel vs. Jun)
Jun: Killing my son won't bring your sister back!Miguel: Where were you when your son killed my sister, huh?
Rage Art
Miguel: You should have raised your son better!Jun (in hers): I won't let anyone touch my son!
If Miguel wins...Miguel: Now, that bastard has a reason to fight me.
If Jun wins...(Light on his chest)Jun: I'm sorry about your sister, but no one is killing my son!
PRE-FIGHT (Miguel vs. Hwoarang)
Miguel: I should have imagined that your allegiance was fake. The man who killed my sister was just a buddy you were at odds with.Hwoarang: Jin might be a jackass, but the only one who gets to kick him out is me! In my own terms!Miguel: Bastard! You will pay!
Rage Art
Miguel: TRAITOR! MY SISTER IS NOT A JOKE!Hwoarang (in his): Regardless of how much Jin screws everything up, nobody gets to kill him!
If Miguel wins...Miguel: Creating that sad excuse for a Resistance was a mistake. I should have been on my own from the get-go.Hwoarang: Why did I create that group? Oh... my master...
PRE-FIGHT (Miguel vs. Lars)
Lars: I won't let you get to Jin.Miguel: Another scoundrel is siding with that lowlife? No problem! I can take both of you out!
Rage Art
Miguel: I HATE SIDE-SWITCHERS!Lars (in his): Before you get to him, you need to get through me!
If Miguel wins...Miguel: I should have killed this idiot a year ago.
PRE-FIGHT (Miguel vs. Xiaoyu)
Xiaoyu: Listen! Jin was not himself back then! He was out of his mind!Miguel: Now that he's back to his senses, he will fully experience the damage he has caused!Xiaoyu: I wish I could have done this the easy way.
PRE-FIGHT (Miguel vs. Nina)
Miguel: I remember you saying you weren't losing sleep over my lack of forgiveness. So I decided to make you sleep for good!Nina: *laughs* I have lost count of how many have come at me with that threat. You are not the first and certainly won't be the last.Miguel: Only one of us is leaving here alive!
Rage Art
Miguel: You have done all his dirty job! I want you to feel in your skin what you have done to my sister and others!
If Miguel wins...Miguel: One less maggot.
If Nina wins...Nina: That work was just one of many. I will kill the entire world if you pay me enough.
PRE-FIGHT (Miguel vs. Eddy)
Miguel: Another cockroach to smash! I remember your lack of remorse!Eddy: I am not proud of that. I was just trying to save my master. It was desperate and in vain.Miguel: Idiot! You cannot even save yourself!