Manitou, you have seriously misread the gemara. It doesn’t say that בן דוד בא after J’m is built. It says דוד בא. First בן דוד has to come, because nothing can happen without him. Only then will he fight Hashem’s wars and win, return the exiles, reestablish the courts, rebuild Y’m, and then the House of David will be re-established, which is דוד בא.
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