Could be wrong, but those are all talking about "broken" finlets. I was under the assumption it was kind of like a broken arm. It can heal and straighten back, but it won't grow back if cut off. Some of them also talk about the "webbing" being torn, that and pectoral fins should grow back, but I'm not sure about dorsal finlets. I've had a couple Retros that have their dorsal finlets missing and they never grew back.