Normal pose is difficult to infer from a pile of bones. So this sort of rethinking goes on quite a bit. I remember this discussion about rethinking the correct

Normal pose is difficult to infer from a pile of bones. So this sort of rethinking goes on quite a bit. I remember this discussion about rethinking the correct pose of the archeopteryx. Less splayed out, similar to this article. And the t-rex used to be posed more upright, now it is posed more horizontally. In the Carnegie Museum the old t-rex was very upright in a fairly static pose, now they have two in rather dynamic pose horzontally with their tails off the ground. I believe some of the earliest dinosaur models were posed in assumed ways that were later drastically changed.