There is a time period before Fitzgerald was appointed that Colin Powell, FBI Officials and Justice Officials knew Armitage was the leaker and circumstances surrounding the leak.
...and knew the leak was not a crime due to two facts:
1. The leak was unintentional
2. The agent was not covert or undercover at the time.
When Fitzgerald was informed, he continued pursuing Whitehouse officials.
Talk about a conspiracy! Fitz has some 'plaining to do!
I find Armitage's head more disturbing than anything.