I agree that this was definitely not a burglary but respectfully, We don't know if the perp never slipped up because as you said, they are holding a lot back. I don't think the not naming of a suspect(s) has anything to do with a perp being in LE or someone in relation to LE. There are numerous reasons to not name poi's or suspects before an actual arrest that have nothing to do with any association to LE. There are many cases where a suspect was on LE's radar but never named until the actual arrest and in regards to the uniform, we don't know if it is authentic or not, and what sense would it make for someone in LE or connected to LE to murder someone in a uniform that could be traced back to them...to me, that flies in the face of a perfectly planned and carried out murder but that's jmo. It's also really not difficult for someone who went through all the planning of this crime to have done extensive research on crime scene investigation and murder investigations from reputable sources.
I think it's possible and/or likely that they held off on confirming the blood on the shirts was from a dog to buy some time or give the perp a false sense of security but I am not ready to assume the Altima is all smoke and mirrors. Not sure if you saw the video of the press conference but they also gave a height range as well, 5 foot 2 inches to 5 foot 7 inches. It is my opinion that this press conference was purposely planned for a Very specific audience. I don't think they need the publics help anymore either, I think they know who did this and for all we know could be presenting to a grand jury or waiting on all forensics to come back before arresting someone. if your estimate that an arrest will come within 30 days is accurate, That would mean this crime was not perfection and this person slipped up somewhere, so I personally will not submit to the opinion that the killer never slipped up.