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Re: Evolution of tyrannosauroid bite power

Because there wasn't much selective pressure acting on them?

"Much" is a relative term too, although I agree that the jaws (and neck) and hips were probably playing a much larger role in prey/carcass acquisition in T. rex than were the arms. Relative to the animal, and the probable size of its prey, T. rex arms were small and weak.

T. rex was pretty clearly using some combination of legs and bite to
capture prey.  The arms were not centrally involved.  (Or if they were
involved, it was in a way -- position sensors for a 'grappled' prey
animal, say -- that didn't select for strength.)

I agree.