Even if they only hold stock positions that you could replicate, you would be buying when Berskshire is already done buying and selling when they are done selli

Even if they only hold stock positions that you could replicate, you would be buying when Berskshire is already done buying and selling when they are done selling. For example, the recent Bershire's position in Activision was disclosed when Microsoft already made the acquisition offer, so it was too late to replicate it.