The myth of the inventor-founder is something from the industrual age. Interesting how it still persists.
Anyone can imagine a "flying car" or a "nuclear fusion reactor". It is a completely different thing having and putting the resources to work: the people, the effort, the money and the time to make something real.
Someone just "having an idea" only works in science fiction, and even there you need to do the work of writing the book, or drawing the comic.
If there is a myth here, it is that it matters who executed it first. It's random.
Disney - animated feature length film with sound, dogged vision of founder
Post / Kelloggs - invention of breakfast cereal, invented by founder (Kellogg's invention stolen by Post)
Carnegie steel - bridge prototype, highly risky and innovative endeavor
Ford - division of labor
Mars - caramel and nougat in chocolate, innovation over Hersheys' plain chocolate, invented by founder
Google - pagerank, invented by founders
He can and should be credited with applying these innovations at scale and ironing out various kinks in the process and popularizing these concepts, but it would be a lie to call it "Ford's innovation", all these things you mention were initially invented by others, although Ford did manage the practical implementation of all these innovations in combination unusually well.