The innocent spin being put on top Apple lawyer Don Rosenberg's departure is that he got a better offer from Qualcomm. But Rosenberg, a decidedly gray figure who came to Apple from Big Blue, served as the company's general counsel for less than a year. He filled a post that had been empty for six months after Nancy Heinen left amid a stock-backdating scandal. And Rosenberg's replacement, Dan Cooperman, comes from Oracle, where he worked for Larry Ellison. Ellison, like Jobs, is a famously temperamental founder-CEO. He's also a close friend of Jobs, and used to serve on Apple's board of directors. This all seems quite cozy, and curiously timed. Anyone know the back story here — and why Apple keeps chewing through its top lawyers?