SoftBank's Masayoshi Son is stepping down from Alibaba's board as he focuses on shoring up SoftBank's shaky finances

· SoftBank's Masayoshi Son is stepping down from the board of Alibaba, he announced in a shareholder call on Wednesday.
· Son was one of Alibaba's earliest backers, making a $20 million investment in the company two decades ago that was worth $60 billion by 2014. He said he will remain a "long-term investor."
· He's now...