bah you guys are blowing this way out of proportion, he is only slightly taller most wont notice it in a lineup, also the fact he is standing straight vs bend at the knees for some of the other pieces.
In addition, this is all based on a cartoon video game, we are not talking about star war vader accuracy here, maybe he is a little taller in the video game maybe he's not, maybe it depends on the version of the game, who knows who cares. He is not out of scale by any means.
And if the tiny height really bothers you that much, just put him slightly behind the others, and the perspective will fix it for you.
Anyone who has a line up, feel free to post your photo with him in it and prove me wrong, but you cant