Rural Indiana native here. I agree with what another user said, many if not most small town Indiana people dress like this guy aged 30+. Once you grow out of your hip-hop, goth, punk, whatever.. phase and get too lazy & unmotivated to try to look cool or edgy, you throw on a generic pair of blue jeans, a random hoodie and/or a jacket and said **** it ... I'm a bumpkin and I give up trying to look cool. Are those jeans and that sweater clean? Okay then I'll wear it. That's the extent of thinking that goes into getting dressed. Thrift stores are often where people get clothes because hey, you're just going to get them dirty working on your car or doing something outside anyways so might as well get something cheap. If you are one of the few who really think its important to look cool, you move to Indianapolis, Chicago, Seattle, etc and don't stay in a town of 3000.
If you're a man 30+ in a town like this and are really stylish or particular it's kind of like.. why are you trying so hard to look cool? Who are you trying to impress with your city boy / metro / hip-hop attire? No one in these towns cares about fashion especially when it comes to men. The pictures to me give very little clues because almost every potential suspect you'd imagine looks like him. 30 to 50, average height, average build, generic bumpkin clothing. Just a random white dude in a town full of random white dudes. (No offense to random Indiana bumpkin white dudes, I'm one myself). Seems like the only way this photo could be effective is if someone saw him wearing that *EXACT* clothing on that exact day. Or is so intimate with the guy that they see his posture in a way others wouldn't pick up on in the "lightbulb" going off, makes your heart race kind of way. Problem with that is he is almost certainly a loner. Maybe has one or two friends and those one or two friends are probably hyper loyal or go weeks without interacting with the guy and wouldn't know what he was wearing on that specific day.
The voice, if it's the same guy makes me think he's more like 45+ years old, sounds like a central Indiana native. (Northern Indiana people have less of a southern accent than he does and Southern Indiana have much stronger southern accents typically).
So what do we really have to work with? We know a generic guy who may be involved was on the bridge at the same time as the girls. They ended up dead Southeast of the cemetery near by. Based on what I've seen, the guy approached them on the south side of that bridge. That's a 1000ft walk BACK across the bridge to get to the other side, a bridge which one wrong step and you're dead. Why does a guy who is apparently so good at going unnoticed talk the risk of holding 2 people hostage on that bridge, force them back across when at any time another hiker could pop out of the north side and catch him when he could have just went south across the bridge into the woods there? What if the girls went back across the bridge on their on free will, went east through the woods near the cemetery out of boredom and someone was parked at that cemetery either visiting or lurking through the woods? I have a hard time believing one guy could or would take them from the south side of the bridge, back across then through the woods. It just doesn't make sense & is way too risky. He could have also followed them back across the bridge unnoticed then caught up with them as they went into the woods. Something about that cemetery being so close by just makes me think it has to be related. Quick access to the bridge, quick access to US 25 and if the girls were hiking through those woods when someone happened to be there, he or they might have heard / seen them there.
Hopefully that's not too speculative, I'm new to this site but can't get this case out of my mind. It's shattered the sense of safety we have and trails like these were a big part of my life growing up, now I fear the next generation isn't going to be able to enjoy them like we did. This guy or guys needs to pay.
TLDR; We need more evidence made public in this case or a DNA match. Maybe the killer(s) parked at the cemetery near by. The guy looks and sounds like a LOT of people from central Indiana.