There are plenty more charges to come, even if most of them go to DW.
LE still believed (believes) DW didn't act alone after they arrested DW. When JW lied, he made LE's job much more difficult as they had to follow up on more than one story from him - and he's not the only witness. I think it's too early to think anyone is in the clear for the murders or lying to LE, as it hasn't even been made clear if the case will be tried in DC court or under Federal jurisdiction. That decision will affect the criteria for peripheral crimes, such as obstruction of justice. JW seems to be home free in DC, as obstruction of justice is primarily concerned with courts/juries. The federal charge has a much broader definition. JW should be worried about that, because his actions fall squarely within
18 U.S.C. § 1001--false statements and concealment of material facts before Federal departments and agencies
http://www.justice.gov/usam/crimina...offenses-related-obstruction-justice-offenses