As for the first part, yes. The second part, yes, I agree with that, but there's no requirement when you're selling to a third party that the third party.... That third party has every right to have managers run the business. If dad is selling to son, and son wants to stay involved, obviously he has to stay involved at some point or in some manner, but maybe not day to day, and he hires a COO to run it.
That happens, and that should not be penalized, either. The son is still going to be ultimately involved in the business, but maybe not day to day.