First, executives will routinely attempt to take the founders' roles. Industries vary widely, but they are roughly "showy spenders" and not savers. Many have no experience in new ventures. They have ridden high and will panic against adversity. If they cannot flee in an overall industry downturn, they will feed on the founders. Be very careful to make "executive" expectations brutally clear and consequences for any and all hubris terminal.
Second, many founders want to be 1-hit wonders. Unlike our industry ecosystem building heroes, they are neither in the ecosystem nor interested in developing the ecosystem. They want in to get out ASAP. Their short termism sadly translates into teaching bad examples to employees.
Nevertheless, the information rich life of the "small rooms" where plans are crafted and industry roads remapped on whiteboards are truly the most wonderful teachers anyone can expect to access.