Nikola's CEO reveals what Elon Musk rival Trevor Milton is really like as a boss (NKLA)

· Like Tesla CEO Elon Musk, Nikola Corp. founder Trevor Milton can be outspoken and sometimes combative on Twitter.
· But Milton has a sense of humility the public doesn't always see, Nikola CEO Mark Russell told Business Insider.
· Milton treats Russell and Nikola's other employees as equals, rather than subordinates,...