Thanks for this. I'll comment on 1, 2, 4 and 5.
1) Short time window to commit crime as you stated.
I think the crime started shortly after 2:30pm and the killer was gone by 3:30pm or so. I think he either just left or he heard persons coming along the bridge/talking and made a hasty exit. (IMO)
2) Three people being on the bridge right after the girls were there who say they saw and heard nothing.
See above. One woman was noted in an article and said she didnt see the girls and went across the bridge and back. She mentioned another couple on the bridge when she got there but we dont know if the other couple went all the way to the SE end of the bridge or if they saw/heard anything. IMO I dont think they saw/heard anything.
http://heavy.com/news/2017/02/liber...ssing-snapchat-facebook-photos-family-bridge/
4) The clothes being found in the stream (has this been reported or is it just rumor? and if it was reported somewhere, were the clothes found upstream or downstream from where the girls were?)
It was reported by a reporter/photographer who was near the scene on Feb 14. He said that from 75 yards away he could see girls clothing in the creek east of the bridge and knew the girls were found nearby. There is also a mention of clothing in transcription on scanner thread. Whether these are definitively connected to the crime we dont know.
https://www.facebook.com/jkyle.keener/media_set?set=a.10209763319577780.1073741969.1174987605&type=3
5) The clean crime scene (again has then been reported or is it just rumor?)
IMO, I think this has been misinterpreted. I don't think anything has been stated about what the crime scene looked like on Tues, Feb 14. Investigators were there for ~2 ½ days before they released the area back to RL. During a CNN interview, the commentator asked RL what he saw when he went out there (which he said was Thurs AM-Feb 16). She asked him whether he saw any blood, did he see a gruesome scene? He answered that there was not much to see other than crime scene tape and the area was still very pristine. IMO yes it was pristine because the investigators cleaned up before they left and released the property back to him. Weve now seen the video of the crime scene area ourselves taken on Feb 16 and I agree, it was pristine on Feb 16.
http://transcripts.cnn.com/TRANSCRIPTS/1702/20/ptab.01.html
http://www.gettyimages.com/license/645276720