Adar Poonawalla, the Serum Institute CEO, who has gone from vaccine factories to splashy consumer-investment headlines, has quietly stepped into the spotlight of India's hottest sporting takeover story. A single, carefully phrased post on X, "At the right valuation, @RCBTweets is a great team", lit the fuse on widespread media reports that Poonawalla is the front-runner to acquire Royal Challengers Bengaluru (RCB), currently owned via United Spirits, a Diageo-controlled company.