Put it this way, you can blame DD for Sale and maybe for losing Bogaerts.
But Betts, the HOFer, that was strictly on ownership. They did not really go after him hard. They made a respectable offer, yes, but then they said screw you when they saw Mookie's counter-offer.
If DD was in control of the situation he would have gladly paid Mookie 375 million or whatever it took.