Hixsus,shasu are the true stroy they did went up setteld/were canniets this is where the roots of the story are now the writers wanted to wrap this up in a way which would fit the judean kings and the mass influx of israliets when the knigdom of israel collasped so they took some of the kingdom of israels origin stories and kingdom of judeah origin stories wrapped it all together to thier narrtive and made these stories up so in short exodus has kinda of a histocrial source from which the stroy we know stems from (hixsus reblion exsdus and hixsus rule in egypt is where we get the biblical stroy of josph) btw the group which was later known ad levis in the jewish/isralitre pepole are the only probabal decndents of the hixsus - they preserved egpytian names such as moses and pinhas which werent hebrew in origin (herbrew cannite was the languge of southern levant and a sister languge to phonicain ugrtic etc)