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Development question

I asked this last month but never received any replies. So, I thought I'd pitch 
it again since I haven't really foudn much information...

I need to figure out how to explain the developmental aspect of the avian 
furcula. The wishbone is a non-endocartilarinous element that develops as a 
connective tissue precursor with no cartilage present. However, our clavicle 
does develop with both a cartilaginous and connective tissue precursors. Does 
this imply the same for theropods and birds? I do not know. Can anyone help me