FMA Manga spoiler

No.13076060 ViewReplyOriginalReport
I don't get what the big deal was that what Ed and Al had transmuted was not their mom. It seems kind of obvious that it wouldn't be accurate, since they were around 10 years old at the time. They wouldn't know how long her bones were or anything. The only thing that seems to matter is the hair color. Or is it that they suffered so much for a transmutation that wasn't the least bit successful? Or will it be revealed later that they had transmuted something terrible?