that is a good point, (no pun intended) but after you inject, you then rub and rest. So the bark creates a "scab" to hold the juices in and with the resting it allows the juice to evenly distribute in the connective tissue of the meat. If you are cooking a piece of meat then poke at it, the heat inside is building pressure like a water balloon that is being heated then when you poke a hole all of the pressure wants out. It is best not to move the brisket / shoulders around too much as that bark is the only thing holding the pressurized juices at bay. It also has the effect that because it holds the juice in, it forces the injection to move through the meat because it is excited by the heat.
Kevin a.k.a. Smokcrates, BBQ P[FONT=Arial]hilosopher[/FONT]
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