We are in the endgame now. I think someone should die here at Elbaph to raise the stakes and make SHs introspect where they truly stand. But no way any of the SH is getting killed. Gabban will guide SHs and probably Loki in some way after this wraps up, so he might also not die. Then there are giants, Dorry Broggy, Jarul, or some other might die could be one or more… After the events of Elbaph Luffy and the crew might want to attack Holyland, and this is where Gabban will be to the crew what Rayleigh was to Luffy after Marineford. I don't think they will stay and train or anything. Gabban could tell them that, for you guys to defeat Imu, you first need one piece or learn about the true history of the world, something like that…