[Smasher]

That Mechagodzilla has two things going for it.
A. It's awesome.
2. It's not Godzilla.
III. It's awesome.

EDIT:
I still can't believe we have to pay for an extra head instead of a hinged jaw.
Not only would the jaw be super easy to hide on Mechagodzilla, the burning Godzilla looks like there is a hinged jaw.

I would say they are interested in the overall aesthetic of the figures so they don't want an extra cut line, but then there is that giant cut line in the middle of the torso.