Usually means they are more than likely going to be given away at some point in the future. Whether that be via in game event or by twitch drops
Funky bap and feskarn brig are ow1 skins so no reason for them to not be purchaseable with credits unless they’re planned on being given out for free so it makes sense why they wouldnt want people to be able to get them
Azure drake brig seems like another aztec sombra, sea captain torb or cyclops hog, a skin that most likely didnt sell very well and is more better served given out for free in an event than rotated into the store where it wont sell if it didnt first time round