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Others have advised you of what a mismatched sibset is. I'd like to point out that mismatched sibsets are actually pretty rare. This is because people tend to like the same sort of names, they like trendy names, or they like unusual names, or they like classic names, or they like creative spellings, etc. There tends not to be any crossover, i.e., "I like both classic and trendy creatively spelled names." You see this over and over in real life. My mother gave all of my siblings and me names that were popular at the time we were born, John, Linda, Janice, Patricia, and Pamela. There's no way my mother would have suddenly thrown in Ophelia or Flavia at the end there. Just not something she would do. She wasn't imaginative when it came to names, and that had already been proven by the first four names she chose. My daughter has three sons and their names are Leonidas, Abraham, and Thaddeus. Obviously my daughter likes old, classic, and what she considers to be strongly masculine names for boys. There's no way she'd go for Jayden or Avery.

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In the post you linked to, the OP was considering the names for a work of fiction and was concerned with making the story believable, so that's really why he received advice on the sibset being mismatched. The mismatched sibset would make the story less believable, as mismatched sibsets are not common in real life. I don't think too many of us here look at any mismatched sibsets that are real and think, "Oh no that shouldn't happen, how terrible." On the other hand, real life mismatched sibsets usually do elicit a response of "It's mismatched", simply because they are not that common, so to see one elicits some surprise.