I don't think he has regressed at all defensively. Licht has been incredibly solid defensively. It's in the opposing team's half of the pitch that he has regressed massively. And yes, his offensive regression has been massive. His assist numbers have dropped drastically, because he can't seem to beat his man at all anymore, and can't seem to figure out how to send a cross in without it being blocked. His inability to get that half step that he got so regularly before, means his crosses and passes are easy to block/intercept. He also gives the ball away too easily in the opponents half. But he always gets back in time when this happens to help break up attacks.
But, there has been absolutely no defensive regression. Rarely do teams attack us down that side of the pitch, and Licht seems to shut down everyone he goes up against. He effectively marked out whoever was on his side in the CL against both Dortmund (Reus), and Real Madrid (Ronaldo)... ROnaldo's first goal, Licht was rightly marking Bale at the far post, who would have had an empty net to score in, Ronaldo had drifted central and was the responsibility of Chiello and Pirlo, Chiello ball-watched, and Pirlo was just too lazy to follow Ronaldo into the box. The second goal was a penalty and had absolutely nothing to do with Licht. Chiello was clumsy in taking out James unnecessarily, and Pirlo failed to provide the help that his position should have provided. Almost all Real's attacking play came down Evra's side.