U new here? Just because the final boss is out doesn’t mean it’s over. They can rewrite entire storylines for Kurtz to manufacture more villains like Anvil. Also (not that I know since I haven’t reached the final story campaign) with Wesson possibly being the secret mastermind, he could have some other secret henchmen. Or just add completely unrelated bosses. Possibilities are endless!
P.s. already revealed there’s another hero in future here: Is this a hero? Or is it a Fill Soldier?