It is so incredibly common in the investment world to mistake extreme luck for skill and cling to flawed methodologies as if they were gospel because they worked once by chance.
Your typical investment "strategies" are hardly better than someone bringing his lucky shoes to a gambling den.
No. Yahoo US was once worth ~$125 billion ($200b today) and Masayoshi's SoftBank owned 28% of it during the peak bubble days of 1999-2000. [1] Yahoo was a very big deal at the time, it was briefly an Internet juggernaut. That's a key reason why he was so rich during the dotcom bubble. That single position propelled his image and made him famous.
To put into perspective how relatively massive SoftBank's Yahoo position was considered to be at the time in the tech world (and more broadly): if you go back to early 1995, it's a sum comparable to what Microsoft was worth ($30-$35b), and more than Intel was worth. The notion that a tech company could be more valuable than the old industrial giants like GM was still a rather confounding premise.
That said, I agree that WeWork isn't exactly "vision".
You need more than a luck to pull it off.