Opendoor hired Kaz Nejatian from Shopify, leading to a massive stock surge. It could be hard to sustain the advance.Just a short while ago, Opendoor (OPEN -0.50%) was on the verge of being delisted by the Nasdaq stock exchange. It was planning on conducting a reverse stock split to avoid that fate. And then everything changed, including Kaz Nejatian joining the company as the new CEO.But have things really changed enough yet? A major decline and a big uptick for Opendoor's stockIf you look at the entire pri ...