Two major flaws with your logic. One, the final artwork is at a completely warped perspective from a high angle. There is absolutely no way you can accurately compare the exact proportions with the concept, unless you really think that the length of Examon X's entire foot is shorter than the length of a single finger on its hand.Well, now that we have full-size art, we can more or less confirm that the ‘mech suit’ concept was abandoned. Notice how there are now two different shades of red on his feet, how much more rounded the organic parts are compared to their previously mechanical analogues in the concept sketch, and how different the proportions in the legs are, with the knees positioned much farther down and a relative thickness roughly like that of a human leg. So much for that.