In life, certainly.
So that's what you mean, the "cartilaginous episternum" of
(older) Paul reconstructions. The 1998 JVP paper on tyrannosaurid furculae has
shown that there was nothing between the coracoids because the coracoids
touched, that's the only thing furcula and sternum were broad enough for. There
remains a bone-free triangle between sternum and coracoids, however;
maybe a cartilaginous extension of the sternum was in there. That's also where
Iguanodon's irregular "intersternal ossification"
is.
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