Sunny Side Up wrote:Well, there're several stages of ret-con to go through.
Original Thunder Warriors were described as being created from grown adults through muscle crafting, etc.. physically stronger than Astartes but short-lived and mentally unstable.
Original Custodes were just an Imperial Guard regiment that didn't like shirts and were stationed on Terra.
New-8th-ret-con Custodes are in no small part based on old school Art of Thunder Warriors, so Custodes now partly occupy that space, both aesthetically and in some aspects of the fluff as being a prior, individually superior to Astartes creation of the Emperor (but not in others, e.g. mentally unstable, etc.., etc..).
Original Thunder Warriors
Original Custodes
The Custodes havent been the shirtless Regiment of Guardsmen for a long time prior to 8th Edition or even 7th Edition when they first got models. They've been the goldy boys since like, late 3rd I wanna say maybe earlier.
Pic related, the same source as your Thunder Warrior.