In chapter 906 we are introduced to what seems to be the “National Treasure” that Doffy has referenced in the past and this chapter itself.
What we are to understand from the panel is very vague however. We see a “special” Celestial Dragon who is not wearing the traditional bubble helmet and suit, holding two wanted posters, we see Luffy’s new one, but the other is not shown. This Celestial Dragon enters a large vault freezer and approaches one of sevenish corridors, and inside we see a large straw hat and potentially a coffin/sarcophagus. The hat is much like Luffy’s but is much larger and seems to rest on top of this coffin, almost in memorial.
All this made me think of the the cover page for the chapter 470
If u see the image upside down you can see that in the wall there is a giant straw hat and those soldiers(?) have straw hats too, you can also see how they are reviving someone.
My theory is that the Marines/Celestial Dragons want to dismantle the Sichibukais and revive the seven greatest pirates (as you can see there are 7 altars).
Is it possible? What do you guys think?
*Theory by Kire2512