You never know what weed Oda smokes so Pell being nuked and alive vs Kaido being alive in Magma (which he can turn into himself is quite possible). I think awakening has incorporated Nika's character into Luffy and there might be a Luffy vs Nika thing going in future.
![Kobeha :kobeha: :kobeha:](https://i.ibb.co/P6XbSwV/kobeha.png)
you can't predict what Oda can do. Also Kaido wanted to die so Luffy fulfilling his wishes as the Sun GOD is one possibility too.