Yep, perfectly normal for Black-Capped as well as some Green Cheeks, depending on their mutation...That first big molt that they have is the largest molt they experience during their entire lives, and it's when they shed their "baby feathers" and grow-in their adult plumage...And a lot of parrot species have adult-plumage that are totally different in color than their immature, "baby feathers"...I have a Yellow-Sided Green Cheek Conure, and his colors changed completely after his first molt...I was actually surprised just how much his colors changed, because his entire belly/chest went from being all red to all yellow with only a bit of red remaining on his lower abdomen; he got red patches on each side of head by his ears, and just like your Black-Capped Conure, he got bright blue feathers on his wings and in his tail-feathers...
I mentioned this in my long, boring response to your introductory post, lol, but all birds/parrots possess the ability to "Drop" their tail-feathers whenever they want to, and they "Drop" all of them at once...This is a survival-tactic/trait that they do whenever they feel very threatened or are trying to be caught by a predator, as predators often grab onto birds by their tail-feathers because they are long, they stick-out and are easy to get a hold of, and they are at the opposite end of the bird from their beak, the "weapon"...So if Yoshi came from a pet shop, it's likely that someone tried to grab him, or maybe he got loose and they started chasing him around the store, etc., and Yoshi, obviously feeling quite scared and stressed being in a strange place with lots of strange people grabbing at him and chasing him probably dropped his tail...You can usually safely assume that the bird "Dropped" their tails purposely if they have lost ALL of their tail-feathers, either that or someone accidentally stepped on their tail, or backed a chair over their tail...I've seen that happen more than once, and ANY TIME a bird's tail gets trapped or stuck underneath something, like a rolling-chair on wheels or under someone's foot, they typically do "Drop" their tail...It's perfectly normal, they all possess the ability to do it, and it certainly doesn't mean that anything is wrong with them...And when they do purposely "Drop" their tails, they always grow right back-in, though it does take a while for them to grow back-in fully, since they're so long and there are so many of them...But totally normal and nothing weird or anything to worry about...
