The family of Junior Seau is reconsidering its decision to allow researchers to study his brain for signs of damage caused by concussions suffered during his 20-year NFL career. "They have now stepped back from what they were thinking initially," Chargers chaplain Shawn Mitchell said. "Nothing is definite right now." Garrett Webster, the administrator and player liaison for the Brain Injury Research Institute, which studies the impact of concussions, said his group has requested the family donate the brain but hasn't heard back.