That reminds me...
Early in the case, this came up, right? And, wasn't that piece of evidence something recovered in Idaho where a discussion ensued as to how to best transport it to Colorado? I'm not sure if it's the same piece of evidence being talked about but, if it is, I can imagine the prosecution not wanting the defense around for testing if that evidence was something like a speck of blood on Krystal's baseball bat. Just some wild speculation there. In such a case, if the DNA belonged to Kelsey, it would not necessarily implicate KK as the killer but it would show that she brought the bat back with her. However, it could create doubt for a jury as to whether KK might have been the killer. If there aren't phone pings from her, in Idaho, prior to and on Thanksgiving and, we know she turned off the Google location app, it might give the defense an opening to finger KK as the one who swung the bat.