Imagine the amount of keyframes :V
I think he started using linear tangents because of an incident with T-Rex and the tangents being all screwy.
Changing it to linear fixed that issue, so I'm assuming he's still using it for a majority of his animations.
I don't think it takes alot of Keyframes to make a wavy Motion like this assuming you're using FK Controls. With IKs and Baked Animations, that's a different story...
idk what happened, and idk his process... idk, it just bothers me...
The animation was only a test, really. Not to mention, it was made in BrawlBox, not Maya.
Ah, in that case. No issues here... lol...