HONG KONG, April 6 (Reuters Breakingviews) – Alibaba's (9988.HK) worth may be hiding in plain sight. The $260 billion Chinese group wants to split off faster-growing, money-losing bets like its cloud and logistics units. But valuing them is more art than science. Boss Daniel Zhang may get more bang for his breakup bucks by convincing investors its main shopping business can still grow. Before last week's proposed six-way carve-up, Alibaba’s market capitalisation was $228 billion, or 10 times the roughly $23 billion of net profit Bernstein analysts reckon its main commerce unit will generate in the fiscal year to March…