Essentially we have these reasons for why we don't know if it's Hannah yet:
1. They are processing cases in order and haven't gotten to her yet.
2. The remains (or lack thereof) are making it difficult to make a definitive conclusion.
3. It's not Hannah and they're trying to figure out who it is before going public.
4. They found more than one person's remains and want to gather more evidence before telling the public.
5. They are negotiating w JM.
What else?
I'm assuming they knew the Fairfax charges were about to happen (even before the remains were found) and that are
very carefully orchestrating the timing of things.
I suspect Fairfax has been working with CPD on timing and that they were waiting to actually go forward with the Fairfax case at the time it was best for things with HG's case.
There's nothing they'd have gotten once they had a confirmation of Jesse's DNA to prove it really was him. The victim almost certainly had confirmed him visually once they had his picture. And once they had his DNA - and the victim knew he was behind bars - there's nothing else that's happened in the last few weeks that would have changed what they have now. Meaning why wouldn't they have moved forward on Fairfax earlier unless it was strategic.
My suspicion is they were holding off on Fairfax in case they could use it (OR needed it) as a bargaining chip at some point down the road in regards to HG.
For instance to say they'd not pursue those charges if he gave over the HG remain locations...or something like that...if they didn't find them on their own. Sort of like how SDSO and SDPD ended up using Chelsea King's case not being a DP case if he gave the location of Amber's remains.
And I think they were just going to give it some time (hoping they'd end up finding them themselves before winter made it nearly impossible) hoping that then they'd be able to actually use it for leverage in another way, which I suspect is why they moved forward on Fairfax as soon as the remains were found.
I equally think that CPD is intentionally not confirming the remains are HG yet. They really don't need to. He's behind bars and he's not going anywhere.
Fairfax can go forward, CPD can take their sweet time, being even more meticulous than they'd want to be anyway, and they can be working on ensuring the HG case is airtight as Fairfax starts moving. And it also lets them continue to pursue what other things he may also be tied to and will make him squirm even more.
I think as soon as he has his first Fairfax appearance they'll confirm it's HG.