Love this post, lol...
Jumping off this, so maybe she was out of weed.
Since we have confirmed she likes to smoke (or did in 2015 or whenever it was), maybe Lucas is near where she gets her weed. If she wasn't already stocked up.
This sounds like a stretch, but I'm basing this strictly on awareness space / geographic profiling aspects, moo.
Eta:
Wait a minute, this is wacky...has Rossmo ever been applied to disposal/recovery???! Can we take our variables and plug them into Rossmo and see what it looks like? We need at least 5 data points...Do we have these?
Eta: off the top of my head, 5 data points (I know there are more as 5 parks have been searched, since we don't know why I'm we should have a couple formulas with and without all the parks maybe:
1. Current residence.
2. Former Residence
3. GPNC / Chisholm
4. Pawnee Prairie (or wherever TES has been this weekend)
5. West Airport Cessna Park
6. Where she lived, grew up
7. Known places they have camped, visiTed etc.
*please feel free to contribute.
Any mathematicians in the house? I always bring up Rossmo, but finding someone to actually take it on is the hard part! FTR the math is way over my head!