[spectrum1234]

There is no doubt one company would succeed better if he gave it his full attention.

But this is a great example of the Pareto principle 80/20 rule. With his last 2% of effort he could engineer the next Tesla car. Or he could get maybe half as far as one of these geniuses on a new vision alone. If this is anywhere close to being true you can have 7-8 companies with very minimal sacrifice.