Zach really gamed the system with his "style" of voice acting. I really can't tell if he's phoning it in or if that's just the bit for the character half the time.
Like I finally sat down and watched the Christmas episode of Space King where Zach plays Rudolph, and if you told me he recorded his lines while scrolling reddit I'd believe it. I've heard the guy get more animated and enthusiastic over spur of the moment hypotheticals.