I pretty much think Luffy, Teach, Loki are basically the main trio of the final saga. All we need is a confirmation that there was a powerful giant who was peers with Joyboy and Davy Jones in the void century for confirmation, which seems likely, since Imu treats the Giants as a major player with a lot of sins, and they used to dominate the new world. Besides that, we have three god fruits(Nika, Yami and Nidhogg, which is the only confirmed one to hurt Imu and be one of the 2 Rocks was looking for) and each being really connected to 2 in the old Gen(Luffy: Roger, Garp. Teach: Xebec and Whitebeard. Loki: Harald, Xebec).
Pretty much my only issue here is... If Luffy is good and Teach is evil, it would make most sense for Loki to be an antihero character, not a straight up good guy. Maybe we´ll see that side against Shanks, but I doubt it at this point tbh. I only wish that Oda gives the actual antagonists half the hype he´s giving to the likes of Loki, Xebec, Harald lol.