If your theory holds true, then why was Apple Corp able to win $500 million from Apple Inc? Do you really think there was anyone confusing the owners of the Beatle's Record Holdings?
Well, that was a settlement, so the strict answer is "Because they convinced them it was easier that way." But while I wasn't confused, I'm sure they were able to make a case that some people were, or the suits wouldn't have gone on that long-- if nothing else, because why bother?
This isn't "my theory," it's the law.