Board Thread:Administrative Requests/@comment-24573226-20160522025838/@comment-26397825-20160522031608

Ah, okay. That's alright. These things happen.

Basically it boils down to both ways are technically correct. Some people prefer one way over the other. The wiki has chosen to not include the S on the end of Weiss's because it ends with an S, which is still technically correct. Changing this would be a lot of work for something that wasn't even incorrect in the first place.