Michael Saylor is also part of the decision-maker of the company, but I don't think all the decisions to buy when ever they are being done by him should have some support and decisions from others too, which they will all have to come to an agreement on when is the right time to use the available resources for bitcoin purchases.
Saylor's success in accumulating more Btc has made many other companies follow their steps to make Bitcoin a company treasury asset. So what is the conclusion for us, of course do not sell our btc ownership because many companies are queuing to buy more BTC.