That's right.He was much more bigger when he offed Wild.But when Guts fights him the second time,in vol22,he doesn't look that much bigger than during their first fight.
it's not really painfull but it's just so damn cool and cracks me up, in vol.2 when the posesed Zondark smacks Gut's on the stairs, guts chops his demon head off then it starts groing tenticals so guts slams it up against the wall, then he realizes he's losing alot of blood and starts flipping out and screaming hahahahahahahahha i love that part
.......I'll stick with Guts vs. Zodd at the graveyard. But its true, Zodd seems to have different sizes, either its Muira just trying to make him look more fiercesome at certain scenes or Zodd has more than one form.