Although i am in agreement with you on feeding in the tank, with substrate is ok. I dont believe the above is correct and Cant be the reason to justify feeding in the enclosure. bone is not dense and for Many reasons and i say Any Wood is denser than bone. Bone has to be strong but flexible to reduce fracture and splinters, its made with a hollow tube with soft narrow and the inside layers made with minerals and calcium deposits that Make a spongey structure. If you looked at both under a microscope im sure you would be suprised at the difference in the sturcture between Wood and bone.
Anyway, slightly of topic there. I just did not Think it was an accurite way to Make your justification. Matt