Out of interest, could it be that Corrine Mitchell didn't hear you because she may have had one or two alcoholic drinks?
No, it couldn't, because she had just come in from work and gone into the kitchen to start cooking her dinner. Therefore, she had had no alcoholic drinks.
Also - you mention Mia didn't bark because she knew you? Do you then think it's plausible for Mia to not have been led to the V in the wall because she also knew Jodi and it was in fact Luke who knew where he was going after all?
I'll try to give this a serious answer. Mia knew Jodi. Correct. Mia knew Jodi
alive, not lying dead in a blood soaked murder scene. In my opinion, it's utterly implausible that "knowing Jodi" would have been a credible explanation for Mia not reacting to the smell of blood. Also, all of the search trio agreed Mia was being instructed to "Seek Jodi, find Jodi," they all initially agreed that Mia suddenly darted over to the wall and started air sniffing, scrabbling at the wall with her front paws.
Why would there have been any "reason" for her to do that at precisely the place she did, if Luke already "knew where he was going?" Or is the suggestion that Luke somehow gave Mia some sort of secret "command" to react at precisely that point? Oh, sorry, I forgot, Mia "knew" Jodi, so wouldn't have reacted at all, so all this reacting that's going on is just... well... let's just ignore it, shall we? In fact, let's get the search trio to tell a completely different story in court - one that says the dog didn't react at all. That way we can claim Luke knew where the body lay, and have people 12 years later trying to fit together the pieces to try to make that claim make sense!