Fischer didn't have the official leadership of the Greens.

Neither that of the Party (that's Claudia Roth of the Fundi wing and Reinhard Bütikofer of the Realo wing - the latter from Baden-Württtenberg, one of those who'd make a coalition with the CDU a possibility), nor of the parliamentary fraction (that's Krista Sager and Katrin Göring-Eckhardt, both Realos). Fischer only had government positions. (The Greens have a rule for the separation of party and government positions, something the Realo wing tried to abolish but failed.)

_{*Lunatic*, n.
One whose delusions are out of fashion.}