User blog comment:AYET/Talk about chapter 716 and episode 604/@comment-10860731-20130731185603/@comment-13876472-20130801213055

I don't know if we are gonna see the united powers of the Ancient Weapons, but for sure we haven't done with Shirahoshi. She, as long as Fishman Island, Jinbe and Sea Kings, are elements of the general plot and we are going to met them again later, or much later. If you ask me, Shirahoshi's ability to control the Sea Kings will be used.

Mayve there are some anime/manga differences on it, I was only watching the anime during Ennies Lobby. But in the anime it is stated clearly by Franky that the blueprints exist in his head.

Violet cannot read info that exists in someone's mind tho. The person should think about the subject. That's the reason she didn't manage to export the info from Sanji's mind. He had "perverted thoughts" instead of "regular" ones that were connected with Law's plan.

As for Jake Jake no Mi. Reading the poneglyphs is something that belongs to Robin's personality. So if Robin "wears" someone he will not be able to read poneglyph, but he will be able to use Hana Hana no Mi and touch Robin's exceptional boobs.