Alright, I know quite a few fans have noticed the amulets that Kamanosuke and Sasuke are wearing in their casual get-up. They look like the one Arago made Kayura wear to brainwash her into serving him. I believe in the original JP for YST, it's referred to as a "breastplate", which doesn't seem like the right term either, but nonetheless, it's undeniably the same object. The only difference is that Kamanosuke & Sasuke's don't have the tomoe engravings that Kayura's did.
Now this has made fans wonder if the Braves are being brainwashed/controlled by Ramaga into doing his bidding. I can't say I have an opinion on this since it's possible. However, these 2 are the only ones wearing it; the others aren't. They don't wear their amulets in armor either while Kayura wore hers at all times, which was why Arago's control was so strong. This could just be another red herring as it would be too obvious. Tsukasa Kotobuki may have just included them as part of the characters' designs as a callback (or part of youja culture), without them having any impact on the plot. Again, not saying it's 100% a false alarm, but I feel it could go either way.