I don't really know anything about him other than he headed up Macro for a while and it appeared he chased down every lead he could and tried a few different things to solve the case.
https://au.news.yahoo.com/thewest/wa/a/29709275/top-cop-taken-off-cold-case/#page1
He was on the case from 2008 - 2015. He started with the CIA doco which coincided with the release of MM footage and some extra snippets of info such as CG was seen talking to the occupant'/s of a light coloured car. In the last two years of JS's tenure, Bret Christian from The Post published a lot of unknown information. The information stopped at roughly the same time JS moved on. It could be a coincidence but it's certainly possible JS wanted to release info (true or untrue) through a 3rd party thereby keeping WAPOL at an arm's length. There's many obvious reasons to do this.
As for mistakes - without a doubt but as to specifics I wouldn't know so won't speculate (much). It's possible the leaking of the alleged failure to investigate number plates from the CCTV was leaked by an internal rival aimed at undermining JS. I've had professional dealing with Govt. Depts. and have seen first hand just how incompetent and inefficient they are so it's likely mistakes were made all through this.
With regards to following threads on the internet, I would be surprised if they didn't follow this thread and BF thread. There's a lot of stuff written about this case all over the internet but the two aforementioned threads are stand outs. I'd half expect them to ask the owners of each for the IP of every user who posts and every user who browses. I have no doubt the CSK has done some reading.
Put yourself in Stanbury's shoes
One of 2 things happen;
a) In 2011 DNA is discovered and with it a link to KK and this doesn't match any of the POIs
b) You don't have DNA, you've run down every lead and come to the conclusion your original bunny is still your best bunny (LW, MAP or whoever)
So what would you most likely do;
a) You have DNA, but no viable POI and you're standing there with your thumb tack in your hands
- Ask every possible POI for DNA
- Revisit KK crime and other local sex attacks
- Raise the reward to $1m to attract fresh leads as soon as you have run out of fresh material in hope of a break. The more leads you have, the more DNA comparisons you can make.
- Go public in hope of attracting fresh leads. The earlier sex attacks could be a focus. The Commodore could be a focus. The more leads you have, the more DNA comparisons you can make.
b) You don't have DNA, but you've just spent 5 years chasing down every lead and your original POI (either from 2004 or 2008 or whenever) is still #1
- You've obviously tried everything and have been unable to get enough evidence for a conviction
- So you run and operation in view of trying to trap the CSK. Maybe release false information through the press. Maybe use a honeypot to try get him to confess. Maybe somehow use an undercover to get close to him and gain his trust. Monitor his internet. Is he interested in certain fetishes? Is he used the dark web or vpn to mask what he is looking at? Can you create an online group interested in that sort of stuff and have someone try to gain his trust?
I'm open to all scenarios but I just find Macro's action strange if they do in fact have DNA. Surely you have to have some sort of funnel to attract POIs?