Say you are playing a 6 deck game. You track a half deck slug that was +12. After 2 shuffles your half deck is now mixed into a 2 deck portion of the shoe. Now, I am not saying that 2 deck portion is +12. It may be deleted to +6 or +4 or even wiped out completely. It may even be +16 by now.
Maybe someone can run when a slug is loaded enough to statistically warrant a raise in wager when it meets a slug from a shoe that is - the same number. Or am I being crazy? (I was going to say batty, but then I remember that batty was a British slang word that insulted homosexuals, so I decided against it, thought I would let you know for no particular reason, I just thought the thought process was funny)