All true.This article: Mt. Herman Road menacing suspect waives hearing in court
Says that DN was arrested on September 25th, 2017 and referred to ISP via a tip on September 29th. Detectives traveled to Colorado and were able to interview him but on October 3rd ISP announced that they were not able to glean any conclusive information to include or exclude him at that time.
ISP further said in that press release (the text of which is at the above link): While the Indiana State Police does not, as a matter of practice, provide investigative information about specific tips, an exception has been made in this instance as the result of numerous media inquiries made about this particular tip.
Because the information released on October 3rd did not exclude him (while also not including him) rumors on message boards continued to swirl until Carter's more definitive statement in February of 2018, provided by @MistyWaters, that:
"As you all know, we went out to Colorado and we spent a little bit of time with him [DN], and he's not a person we care a whole lot about at this time," Superintendent Douglas Carter with the Indiana State Police said Tuesday. “Until somebody is arrested, we’re interested in almost everybody.”
Another link for that statement: Daniel Nations no longer a major concern in Delphi murders
I think from these statements from the ISP about how they are going to conduct themselves (not labeling POIs publicly and not commenting if any particular tip proved valuable), we can say that we should not expect to hear anything about JBC either way at this time.
MOO the message boards continuing to buzz about DN was the reason for the second statement in February.
MOO LE provided the "not of interest at this time" right after CO visit.
RL also continued to get web buzz after it was apparent he was not POI for the murders.