Likely because there's less room for hi to look like an amalgmation of crap and detritus, as he did in the movie... no, really, he was kinda cool as a character, but his appearance needed work. The fact that they had KENPACHI FREAKING ZARAKI from BLEACH do his voice, along with the voices of ALL the Gaia Memories and Drivers/Devices, made it only... SLIGHTLY more badass and quite a fair bit more CREEPY. XD
You. i'm trying to work out the details of an OC Gaim Rider, but i can't figure out how to do the armor... I'm trying to do something called "Powered Arms". Two Lockseeds at once, in a different fashion than "JinBar Lemon Arms" upcoming for Gaim.
Although his appearance in the movie wasn't quite important (except the fact that he is the boss for his movie), Core is my favorite rider's in design. It's simple, easy to made, (he has more simple design than Arc, though). And off course, His burning body.... looks him more diabolical.