Yup, the secondary has been dreadful. As you mention, a lot has to do with turnovers. Not just from Ditz, but our rookie WR/returner Jalin Marshall has fumbled twice resulting in immediate scores. But that's still no excuse for how they've been playing.
Now I know many here would like to point directly to Revis considering the past, but I'm not all that concerned with him or any of the other corners. It's the safeties. Holy sh!t have they sucked! No communication and horribly blown coverages. Really hoping it's a scheme fix of some sort, but those guys are running around blind back there.
On a side note, he's not technically part of the secondary, but I am thrilled with out rookie LB Lee. He got killed by Graham yesterday... but it's Graham. If you look at the stat sheet it looks bad, but if you watched the game, when Lee had coverage, it was damn good coverage. Graham is just a beast. A bit more experience and we may have a legit shot of slowing down a certain TE in our division. (Not that it matters much this season with Ditz at QB.)