Key PointsAlphabet's AI capital expenditures and high-profile departures of two key AI leaders have spooked investors.But Greg Abel led Berkshire Hathaway to invest $10 billion to help fund Alphabet's AI spending.Warren Buffett loves for a stock to decline -- so he can buy more.10 stocks we like better than Alphabet › Last year, Warren Buffett corrected one of his previous investing mistakes. He initiated a sizable position in Google parent Alph…