It could be. Up till the Olympics Ferrer was in his best form ever. Now is a bit worse with more misses and less depth on shots. Some off serving days as well
Yeah, I kind of agree that he's not been playing well since the Olympics. He managed to go quite far in the US Open thanks to a weak draw and because he is strong mentally and was still able to deliver on important points... But Wimbledon was the last time I saw him produce his best tennis this year.