I don't think they are isolated. He just doesn't like or is not comfortable challenging for headers. He always prefers to try and use his body to stop the opposing player getting a header in. Often it works but when it doesn't it gets highlighted. Even going back to the year we missed out on...
I agree Bruno wasn't at his best last night; however, I thought he was one of the few from both sides who was still going strong stamina wise at the latter stages of the match