Funnily enough it looks like both the cover story and the current events will link to Blackbeard getting 2 of the poneglyphs' copies from Big Mom's territory and from Law, with him getting Pudding to be able to read them.
But it also means that Aokiji is actually working for Blackbeard, and since we saw Burgess, Van Augur, Catarina, Pizarro and Doc Q in other missions, the other mysterious silhouette alongside Aokiji will probably either be Shiryu or Lafitte