Most of the report came off quite basic and humdrum to me.
Rib healing could be anything from emergency revival efforts, breathing machine during infancy to bone bruising. As we haven't seen an MRI to compare severity of the ribs sustaining this regrowth it's up in the air.
How does one say this, EG's method of dumping Lucas doesn't leave room for postmortem 'travel' with elements and insects. Unburied, bodies seldom stay in the same exact space as last left. Blood pools & decays fastest, organs are next, flesh lingers longer, fats alter into chalky residue, skin tends to go in stages as entry for bacteria & parasites- otherwise fragile and can dry into a papery covering.
On the one hand conditions were perfect for mummification, and on the other EG clearly waited a while to put Lucas under this bridge.
A mess of brambles may hold a body in place, but it's hardly protection from other elements in motion.
Considering the weather picking up and recent series of storms prior to Lucas being recovered, wheresoever wind and water swept, so would both of these crucial body parts (objects in repetitive motion may act like saws as well).
Were I in Kansas, upon first sight in exam I'd be out there panning that pond for the missing parts STAT. What caused the ME's office to avoid this action?
EG picked a powerful weapon & fired at very close range; even so it's not like she'd detonated a stick of tnt in her head- most connective tissue does a decent job of holding things together to a degree (elastic, allows for expansion without loss of cohesion).
There is no 'good' way of expressing the effects of expanding gasses involved in EG's last act, without meandering over minutiae of angle of impact vs tissue involved.
It's not as much that there are conflicting ideas about her remains in the CR, as that there is a mental block that conveniently prevents most people from perceiving another in such a way.