I am of the assumption that any player that isn't a first round draft pick, or the top $$$ signing in IFA is purely or at least almost purely the work of the scouting department. A CBO often doesn't know most of these guys.
Take Wilyer Abreu for example, Sox had a deal with him in 2016 in the international free agency system but they lost the ability to sign anyone that year due to penalties.
Yes, Bloom traded for him, but the Sox scouting and developmental department obviouslly really liked him. It seems logical that they were the ones telling Bloom "this is the guy, this is the guy we think is going to be good" years after the fact.
Bloom, Dave D, Theo, Breslow, whoever.....they all do the same thing. They're making decisions largely based off the scouting of others. What seperates them is their ability to swing a trade, negotiate, bring in the right personel to scout and develop guys etc etc etc.