the fact that your "teeth marks" are so coincident with the calcite veins in a consolidated rock sets an order of occurence that cannot be denied
1the rock was deposited as a sediment or emplaced as an igneous mass (I think its metamorphic actually)
2the rock was stressed and cleavage was established that includes the calcite
3the rock was broken off its "ledge"
4the rock was rounded by a stream
5the calcite was "plucked " from the veins as (probably) part of the stream tumbling and erosive process
The story should be bas upon the simplest of axioms, rather than manufacturing a story about dinosaur teethmarks in hard rock
PS , Ive seen plenty of carnivore teethmarks on bones of prey, both moern and fossil. They dont look like the rocks youve posted. I havent seen examples of your coprolites so Im at a loss to give an opinion about those.
Ever hear of Occums Razor?? In descriptive sciences, it usually works.