Hello jayjeti,
I agree, rule out Bigfoot and then look at the picture. Look at the bite marks on the ribs, the 1/2 inch width of the incisor marks, the arc/radius the bite, the severed skulls, the bones piled in a stack and see if someone can come up with another solution that fits the profile.
Of course if it was only one creature doing the damage then there is much to be said about what it is not. But if several different species were present, or alternatingly present, then it becomes more difficult to nail down Bigfoot as a candidate. Still in all though, heads not connected to spines and bone piles would be strong cases for ruling out typical fauna even if the teeth marks aren't definitive in showing what exactly scavenged the animals. I have no issues understanding why BigTreeWalker was drawn to this discovery and then pursued it so tenaciously.