See
Exodus 4:24-28.
While it did not actually happen, Moses was about to be replace by God's second choice, Aaron. If it had not been for the timely intervention of Zipporah, there would have been no story of Moses to retell throughout the ages. It would have been the story of Aaron the Law Giver.
Also note, Zipporah took authority over Moses as husband and head of the family and performed a "man's only responsibility".
Our God just does not fit into a box.
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Another "second choice" was the establishment of the Levitical priesthood.