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T-rex leg length & walking

I'd like some clarification regarding the issue of rex's leg length as
mentioned in The Ultimate T-rex. First, how is it that 2 paleontologists
(names forgotten, Horner v Currie?) can arrive at 2 different conclusions
regarding bone length? Were they looking at the same specimen? Could
differences have something to do with growth/age of specimen? If the
thigh and shin are the same length, does that mean rex could both run and
walk? Second, how can walking be derived? Can't walking simply be seen as
slow running? Derived from what?
Blaise "It's only a flesh wound" Considine