Everything below is JMO, speculation and thoughts...
In the absence of LE releasing further info since April 22nd, I know that many of us have been watching as many YouTube videos that we can get our hands on to get as much info about this case as possible.
Although many of these videos have been a valuable resource for us with respect to timelines, witness sightings, debunking rumors, etc. they are not a from the 'horses mouth' source of info that can only come from L.E.
I am also keeping in mind that the reason while LE has been so tight-lipped on DNA and witness sightings is to
preserve their case.
I am having trouble validating that a person calling into a YouTuber would be in possession of such valuable information about DNA found at the crime scene that they would feel it is okay to release it.
In an important case like this, I don't think that L.E. discusses any crime scene details with close family or friends, or leaks out info, no matter whom they are speaking with. It just doesn't seem like a standard practice, especially since most of the key players involved and in who are in possession of such info in this case are so dedicated to seeing
this case solved and the killer arrested and brought to justice.
In addition, should this person have an 'insider resource', they would be better off containing the information they are given in order to obtain additional information if they are that interested in the case, and not be disclosing it to the general public so that their identity can be discovered and possible repercussions can take place.
I am taking much of this info about 'touch DNA on the shoulder' with a very fine grain of salt. I am not losing hope that LE will have something solid to connect the killer to this crime.
On a different note, this was shared in another group and I found it helpful and interesting with respect to CODIS and DNA Submissions.
http://www.dps.state.ia.us/DCI/lab/CODIS_DNASubmissions.pdf
His clothes, shoes/boots and his weapon are somewhere waiting to be found, and
there is evidence of this crime on all of those things.
He went home that day and sat on his couch, used his bathroom and slept in his bed. Traces of those girls are where he lives, whether he realizes it or not.
The evidence is there. L.E. will find it.
Again, JMO