What’s odd is that you are the only person who has this information. Last I checked, dinosaur bones are just as solid as our own bones, and this includes the therapods.
It it the microvascularization found in these bones that leads to the conclusion that they are related to birds, not hollowness.
Last year examination of this very same fossil revealed layers of bone morphologically identical to ostrich medullary bone. Avian medullary bone is a specific feature unique to birds, used by females for rapid storage of calcium prior to egg laying. Medullary bone of this type has not been found in any other type of animal until this point. This provides another piece of evidence suggesting an evolutionary link between birds and the theropod dinosaurs.
You use the word identicle, yet the science reports I see say ‘similiar’ not identicle.
As well, this goes offtopic (not that it isn’;t slightly important) from the main issue of how old the bone is- to which the scientific comunity has to make a cop-out statement that there ‘must have been a fairly remarkable preservation system inplace in Montana’ and that “geochemical and environmental factors” that could have preserved the tissues are “as yet undetermined,” Boy howdy I’ll say!