With the current Sauber drivers situation in mind: What teams had more than two drivers under contract and it got a problem?
Of course we have some teams in the past who raced with more than two drivers with drivers beeing replaced by other drivers or the Red Bull situation in 2005 with Klien and Liuzzi to share one seat. And some centuries go there were more than two cars allowed in one race.
But were there situations simular to the current Sauber situation?