Garth'zel's aware that he isn't a particularly good person, giving being so doesn't mesh with being Sith. But what he is, is someone who manages to keep the not-good portions of himself on a tight leash.

"More the monkey-lizards, really. Well, and carrying everything around would get annoying after a while." Things don't have to be heavy to get irritating to haul around for long stretches of time.