PHILADELPHIA — The NFL on Wednesday urged a judge to approve an estimated $1 billion settlement of concussion lawsuits despite concerns raised by former players or survivors who feel left out. The 65-year fund would resolve thousands of lawsuits that accuse the NFL of long hiding what it knew about concussions and brain injuries to keep players on the field. The NFL now expects 6,000 of nearly 20,000 retired players — or 28 percent — to suffer from Alzheimer's disease or at least moderate dementia someday.