I don't mean to cause a brain injury
RE the voice and the pictures of BG - I don't think LE was ever clear if they are one and the same or separate.;
"During the news conference. Sgt. Tony Slocum said the search continued for a man seen in a photo. Investigators revealed that the photo also came from Liberty German's phone. They said it's possible the voice in the recording is that of the man in the photo. They also acknowledged that it's possible more than one person may be involved."
UPDATE: Police say photo of suspect in Delphi homicides came from teen’s phone; audio released of man’s voice
RE The sketch vs the Pic on the bridge they were more clear it seems:
"Police say they hope the sketch will help clarify some of the pictures that were previously released regarding the investigation and the man on the bridge. Police say
the sketch of the suspect is based off witness tips, including one woman who told police she saw this man near the Delphi Historic Trails the day Abby Williams and Libby German were murdered.
"We feel this is very important because
it actually gives a better view of the person in the picture that you see down below," Sgt. Kim Riley said at a press conference"
[...]
"We’ve got the information out there, the pictures out there, now
we’ve got this composite that we feel it is the same person and we just want to make sure that people realize this picture is this person ," Riley said.
Police release sketch of man accused of murdering Delphi teens Liberty German and Abigail Williams
Also; "The man photographed walking on a trail near the Monon High Bridge, the last place teens Abigail Williams and Liberty German were seen,
is now considered the main suspect in the case officials with Indiana State Police said.
ISP: Man in photo considered Delphi suspect