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Horner's Pachy Lumpin' - Your Thoughts?

I've just read the Horner paper alleging that Dracorex and Stygimoloch 
represent juvenile Pachycephalosaurus at differing stages of development. I 
think he presents a reasonable case, especially for Dracorex being a younger 
Stygimoloch, but I'm not wholly convinced of the alleged synonymy of all three 
genera. The purported erosion of the Stygimoloch horns (balatant sexual display 
features) into the more diminuitive, rounded knobs of Pachycephalosaurus upon 
reaching maturity (right when such features should be *growing*) would, if 
true, be a chin-scratcher.

I was just wondering if there were any DMLers who felt strongly about the 
proposed Pachycephalosaurus-Stygimoloch-Dracorex merger. I get the impression 
there is some level of skepticism or ambivalence to the proposal but haven't 
been actively sought out others' opinions until now.

~ Abyssal