Prosecutors in the first stock option backdating trial opened an important door Friday — and lawyers for defendant Gregory Reyes barged right in.

In his trial on charges of fraudulently manipulating option prices for employees, the former CEO of Brocade Communications has been unable to bring up a key argument that his lawyers were making publicly for months before proceedings started: that Brocade is one of dozens of companies with similar option issues and was singled out unfairly.