If anyone can figure out WeWork's value, it's SoftBank: Pro

SoftBank recently announced it will take control of WeWork in a move expected to value the company at about $8 billion, according to the Wall Street Journal. But WeWork wasn't SoftBank's Masa Son's first risky investment. Uber, Slack, DoorDash are all among the venture capital titan's ventures. So, has WeWork tarnished Masa's reputation? Robert Safian, founder of The Flux Group and former editor-in-chief of Fast Company, joins CNBC's "Squawk Box" team to discuss.