Sorry, I’m not seeing where your point is going.
I think Just MT follows the flawed BRitish-Hebrew idea that the English are decendents of the lost tribe. This idea came up during the British Empire in the 18th century to justify the English Empire’s “right to rule”. This is based on a lot of flawed, easily refutable ideas like: “the lost tribes escaped from Assyria” and went gallivanting around Central Asia, becoming the Aryans” — this is silly considering that ARyans had already moved into Turkey (hittites) ardoun 2000 BC (the Egyptian pharaoh fought them at Kadesh around 1800 BC), the Aryans had moved into tyhe Eastern fringes of what is now Europe (the Ionians/Achaen GReeks, the proto-celt-slav-germanics) and had moved into Iran and Western China by that time (they had been in north-western India for a millenia prior to that, probably splitting off from the Dravidians 4000/6000 BC when the Dravidians would have been Sumerians, Elamites, Harappansetc.
My point is that Moses was 'elected/selected' to pen for us even to this day the Creator our Heavenly Father. There are but a few examples of men in flesh that set the example of 'faith' and love of following the Heavenly Father. Enoch, Noah, and Job are some of the few like Abram/Abraham that fit the profile recorded by their deeds and examples. The Ten Commandments were given in stone to a bunch of hardheaded peoples, that even through their being saved could not bring themselves to be faithful and formed themselves a 'golden calf' to worship. Yet all of what Moses penned was not a first hand account but what was given to him to put down. John 1:1 says In the beginning was the Word, and the Word was with God, and the Word was God.
While the literal word 'passover' is not attributed to Abraham, there is no doubt that Isaac did not symbolically represent that future one and all time perfect Lamb of God passover. Moses does not give the details as to how Able would have known what offering would be respected by the Heavenly Father, but what we are told is that Able was a keeper of sheep. Yet time and again that Word sheep symbolizes the children ... even Christ said 'Feed My Sheep', Christ was not talking about literal food, but the Word from the In the beginning.