You know, I never really thought about how utterly MASSIVE he is. So, in ROTS, we all know about the meeting between Grievous and Anakin, and how he jokes about Grievous being taller. Put this into perspective: Anakin Skywalker is 6' 2". Darth Vader is 6' 8". General Grievous is 7' 1", when he's standing up straight. He's hoping that someone who is almost a foot taller than him, would be bigger or taller. Personally, I think Grievous is the second tallest character behind Chewbacca. That's just my personal thoughts about it, you don't have to respond.