Imagine the following: You ask a question about a software or programming language or whatever.
Your question is answered first by somebody who knows his stuff, has long time experience and may also already have a high reputation.
Then, some time later, the founder/owner/developer of said software or programming language answers. This answer is the same as the one from the person who came first. Furthermode since he invented what you were asking about the answer most certainly is correct.
Now which answer do you accept? The first one? But you didn't know for sure it is the right one until the second one. So the second one?