Matthias

I don't know, I think he is too strong. I only see him joining temporarily, he is too strong right now and would overshadow the monster trio. I also think he will stay in Elbaf and people will recognize him, much like Yamato. He might join as a strawhead ally in the final far, but I don't see him joining the crew for good. He might join once Zorro and Sanji recieved one more upgrade, once Zorro masters his conquerors haki and once it awakens in Sanji.

People watch too much Naruto. We would know by now if Zorro had any eyes powers. Loki is most likely using observation haki and doesn't need his eyes. Everything else is just speculation.

You're right. I mean we have an official translation that says it's his hybrid form and in the original japanese panel they also say hybrid form (Jinjuugata) instead of awakened form (kakusei form).

But Luffy already uses an advanced form with conquerors and armament haki embued en his attacks. He also uses haki constantly in gear 5 and used his new haki attack to defeat Kizaru. He will definitely improve it further though, seeing Gabans attack.

Ussop already knows observation haki unconsciously.

I feel like we will have a team of cremates that will know observation haki, like Ussop, Nami and Nico Robin, Brook and Chopper will use armament haki.

Yeah in the summary they say that Shamrock has surpassed Shanks, when there is no reason to assume this. Of course HK need to be at the level of an admiral or higher, They are a authority higher than the Admirals and were also introduced in the endgame. I don't think that Oda wants to confirm their strength just yet, to keep the Admirals relevant and I don't think they will be that much stronger, they will just have more quirky powers a d regeneration. Though it's not confirmed yet if only Gunko holds that power or all of them. What really surprised me was the damage that Usopps attack on Gunko did.