Despite having been rivals with Gol D. Roger , Whitebeard held much respect for him. Not long before his death, Roger met with Whitebeard on an island to have what seemed to be an entirely cordial drinking session, with Roger even offering to give the location of Raftel to Whitebeard, and when Whitebeard asked Roger about the Will of the D. , Roger willingly told him about it.  Upon learning that Ace was his rival's son, Whitebeard did not see his bloodline as an inconvenience, and even tried to inspire Ace to respect Roger as his father. 
But here’s the thing—Musk is not a fool, and he hadn’t built bad companies. He had built very, very good companies. It’s just that creating a reliable rocket is unfathomably difficult, as is launching a startup car company, and because no one wanted to invest in what seemed to the outside world like overambitious and probably-doomed ventures—especially during a recession—Musk had to rely on his own personal funds. PayPal made him rich, but not rich enough to keep these companies afloat for very long on his own. Without outside money, both SpaceX and Tesla had a short runway. So it’s not that SpaceX and Tesla were bad—it’s that they needed more time to succeed, and they were out of time.