43 is a part of the prophecy that Babylon will take the Jews into captivity, specifically it includes the promise that they will be brought back to the promised land after they have been punished for the years they did not set aside as they were told to. From that exile you get the “Danials 70 years”, etc., and so on, as I'm sure you well know.
Now I really have to go stone a neighbor to death so just think whatever you like about whatever you like. You are, after all, your own final authority in all things.