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Another parable of the vineyard is in D&C 101:43-62. Verse 43 unlocks the purpose of the parable. The tower is the temple. The parable is referring to the Saints driven out of Missouri.
Isaiah 5:2
I like how, after claiming his territory (his goals), the first thing he did was remove the stones, taking out the things that would prevent growth of the fruit.
Isaiah 5:8
The wicked are consolidating their power and resources, so that only a few may rule, "that they may be placed alone."