I guess, it'd be whoever that has its merger and acquisition teams in order. Microsoft has ably demonstrated the pedigree to make bold acquisitions, over its long, fabled history.
As it is, they're incredibly overvalued, even after their fall from almost hitting $1B. At their current market cap of ~$663B, they still have a P/E ratio of over 650. That is absolutely insane.
He isn’t shorting it. He bought put options around the time it was added to the S&P 500 in late 2020. Probably a bet that most companies have a pop and return to trend period following addition to S&P as well as a bet that interest rates would rise which affects stocks being valued on a discounted cash flow basis.