Nice job. I like this Juggernaut a lot, even with its current coding faults....on to the visual ones, shall we?
The new Sprite stance is awesome and really fits his huge perspective well. A few things:

Looking closely at the old stance, you can see that you are missing some colors from the palette set in the new stance. These are the Darkest color (gauntlets and pads bottom edge) and the lightest color which provides shine to the armour. Without these two colors the new sprite looks kind of plain. I suggest you add these to the new sprite since they are already in your palette and will give more detail to the sprite.
Secondly, is it just me or does anyone else notice misaligned sprites in the stance anim? Its barely noticeable but even if you look to the gif on your thread opening message you will see at least three frames are one pixel off to the right. This of course can be easily corrected.
Thirdly...why not use Hires MVC2 effects better?
Hence all the mentioned, this Juggernaut is very refreshing and cool. I look forward to updates.