FWIW the best theory we have now is that since the earth was very hot for a while after the moon formed, the radiating heat kept the near side of the moon molte

FWIW the best theory we have now is that since the earth was very hot for a while after the moon formed, the radiating heat kept the near side of the moon molten for longer. That means thinner crust on the near side which makes it more likely for early meteor impacts the punch through the crust and cause lava flows. This seems much more likely than a secondary moon impact that happens to hit the far side. Crucially, this should be testable - which is great!