At the time--and I'm rarely right on these points--I thought the Sox had little chance of signing Mookie long term because I believed the Dodgers would spend what it took to get him.
In his last 5 seasons (2015-2019) with the Sox, Mookie's WAR's were 6.0, 9.6, 6.4, 10.9, and 6.8. In his first four seasons--making top dollar--with the Dodgers his WAR's have been 3.4, 4.2, 6.4, and 8.4.
Nevertheless, I agree with the consensus on talksox--that Mookie, not Raffie, was the one to keep. But the 2019 season, when the Sox had the biggest payroll in MLB and couldn't even make the postseason, convinced JH that spending big was not spending smart. Since then, the Sox have spent less and spent dumb.