Answer: The brown inner leaves indicate a nutrient or water stress while the head is forming. In this case, it is probably due to inconsistent soil moisture while the head is forming. To avoid, keep the soil consistently moist. It's true that if you cut the cabbage from the stalk that new cabbages will grow. You could rub out all but the biggest one and allow it to grow. It will never get as large as the original cabbage, but it will be edible. Since you have multiple heads forming on the stalk you could remove all but one or you can allow them all to grow. They will be edible but small.
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