One of the things I rate my toys on, is their fun factor. And on Transformers, that includes fanmodes (not to be confused with Fanmode). Considering that the Cybertronian mode on Animated Megatron is pretty sketchy at best, I much prefer this Japanese Feudal Samurai Centaur mode he’s got going. Note that the Fusion Cannon need not be attached to his back.
Edit: Incidentally, his horse feet ARE poseable. You can have him do the kneeling thing or some 3 foot variation or something.