It is an insightful gallery of pics, for sure!

I actually kind of liked the prototype's proportions a little better, at least the greater gap between its legs looks a whole lot more aesthetically pleasing than what the final resulted with, in my opinion anyway.
I especially prefer the prototype's head crest too, but I can see why they had to modify it taking into consideration how the head resides behind the upper jaw/teeth of the Beast mode - Still, spikier head crest FTW!