I think you're better off hammering the consistent message (that Pioli is the root of fan discontent) home and letting the rest take care of itself.
ALL I WANT FOR XMAS IS A NEW GM - SOC
If Pioli is already as good as gone, you still win.
"Well, it is one thing for Bill Clinton to say, I feel your pain. It is another thing for Barack Obama to say I feel your pain that I have caused." - George Will