>>58425871I'm not sure why they did that way, it's not like Totodile has a different colored jaw, it would have been better off being like this
>>58424276 with some sort of plating/blades on its arms to match the helmet length and color.
All I can think of is that they really wanted to force that particular Kamen Rider theme of using only arms to form the lower jaw at the same time as they also wanted to force the oversized Totodile head and it doesn't really mix well since the Kamen Rider guy's helmet was only as long as his arms were (the other issue with that design aside). Funnily enough Kamen Rider dude's arm colors match his helmet too.