Could the Founding Titan free Annie from her hardened cocoon? Currently, Annie is in a cocoon of the same material that the walls are made of (although a transparent form of it I guess).

Since the Founding Titan could command Titans to harden, could he also command Titan's like Annie, to "soften"?
This is explained in chapter 124 of the manga, when 


   Eren ―having the founding titan powers― lets out a huge roar, which was a command for all hardened titans to break their cocoon and thus Annie breaks out of her cocoon as well.  


Another way for the cocoon to break was with the help of


   the Jaw Titan, as it has enough jaw power to smash open the cocoon, just like when Eren defeats the War Hammer Titan this way.