Zane says (to Ty), "...You're close to the same size. I'm just bulkier, is all."
I remember something in B&C where Ty is thinking about how Zane has lost weight, gotten leaner. But leaner than bulky seems like he'd still be a big guy. I stand by my statement that it was ridiculous to suggest that the Snake Eater was SOOOO much bigger than Zane, unless the dude seriously was at least seven feet tall.
Also? That fight was fucking awesome sublimation! :D